Calculate The Heat Of Solution For Naoh

00 g of NaOH. After they reacted, the mixed solution reached a maximum temperature of 26. Similar to the hydration of sulfuric acid, dissolution of solid sodium hydroxide in water is a highly exothermic reaction where a large amount of heat is liberated, posing a threat to safety through the possibility of splashing. 50 L of solution? Calculate the number of moles of solute present. 50 mol of NaOH M = =6. The heat capacity, which is defined as the amount of heat required to raise the temperature of a given quantity of a substance by one degree Celsius,( unit is J/ 0 C) of the entire system, denoted by,is represented as the sum of the heat capacities for the individual components involved in the reaction process. 00 mL of a 1. 1) Calculate average volume of sodium hydroxide needed to reach the end point. The molar heat of solution, , of NaOH is -445. !!In principle,asolutioncanbeasolid. So, the molar amount of HCl is: n = M. 105M NaOH(aq) necessary time react with 23. It is misci-ble with water at any ratio. Disposal: Discard the salt solution into the "Waste Salts" container, followed by additional tap water. 24 milliliters. If the density of the solution is 1. 62kJ/mol(In case you didn't know, that's a value that's been calculated. What is the molarity of a solution that contains 75 g of. Calculate the heat (calories) produced by the solution of 3. 100 M NaOH solution 2. Step 1: What is left in solution?. 5% What two criteria must be met for a compound or a solution to be an electrolyte?. Making Normal Solutions from Concentrated Acids Tim Loftus The last article covered the concept of Normal solutions in the laboratory and how to calculate the equivalent mass of a compound. Aim To experimentally determine the enthalpy change of an acid-base reaction, otherwise known as the heat of neutralisation. 430 M HCl solutionb. 38 minutes ago Given the balanced equation: HBraq) + NaOH(aq) - NaBr (aq) + H2O and remembering that Molarity = moles/liter OR mmoles/mL (1) (a) Calculate the number of mmoles of HBr in 100. ››More information on molar mass and molecular weight. 00-milliliter portion used for titration. It may be either negative (exothermic - heat given off because the mixture has a lower enthalpy than the pure components) or positive (endothermic - heat absorbed because the mixture has a higher enthalpy than the pure components). Heat energy = cmu, where m is the body mass, u is the temperature, c is the specific heat, units [c] = L 2 T −2 U −1 (basic units are M mass, L length, T time, U temperature). I got the molarity of NaOH right which is 0. 0 M NaOH at 25oC in a calorimeter, the temperature of the aqueous solution increases to 33. 0 mol NaOH 1 L mol NaOH solution 1 mol OH 1 mol NaOH 0. When you have finished your lab work, you may discard all remaining solutions in the sink. 05 F in H 3 PO 4 with 0. 18 J/(g*C), and that no heat is lost to the surroundings. Figure 2:emperature v/s Time graph for HCl-NaOH reaction. 50oC was obtained for δT. Weight of acid or base in grams = 25 Volume of base or acid = 30 Normality = 15 Solution:. In mathematical terms, pH is the negative logarithm of the molar concentration of hydrogen ions in the solution. The heat capacity of the calorimeter is 279 J/°C. Â Help me please! Specific Heat of NaOH? | Naked Science Forum The Naked Scientists Toggle navigation. 102 Mol/1L x 1 mol CH3COH/1 Mol NAOH x 60. 1 M NaOH by dilute 3 M of NaOH, using the following the formula…. The density of the solution is 0. An aqueous solution of sodium hydroxide contains 20% NaOH by mass. Write the net ionic equation for the reaction between solutions of potassium hydroxide and sulphuric acid. IV Data and Calculation 4. What is the molarity of a solution that contains 75 g of. The element's natural state of aggregation is the phase and molecular structure that is most stable at 25 o C and 1 atm. Record the heat capacity, Ccal, in the Part 1 Data Table. 00M HNO3 with 50. 5 ml, respectively. Heat capacities of NaCI(aq) measured at the same time as those reported here for NaOH(aq) were in good agreement(') with literature values. Calculate the heat released or absorbed by the reaction. Baker) as described above, and stored under helium. Calculate the value (calories) for the heat of solution of 4. The heat capacity of the final solution will be less than that of water. , enzymatic methods of analysis, etc. In mathematical terms, pH is the negative logarithm of the molar concentration of hydrogen ions in the solution. 00M HNO3 with 50. 50 M HCl (aq), DI water, and a crushed antacid tablet with a total volume less than 75 mL. What is the specific heat of NaOH and = 0. In Parts A and C, the moles of NaOH are calculated from the mass of solid NaOH. Continue swirling and recording the temperatures until the temperature has reached a maximum and. Acid and Base pH Calculations – Supplemental Worksheet KEY For each of the following solutions: Write a chemical equation, identify the limiting reactant (if there is one), and calculate the pH. Listed with Coldwell Banker Mid Am Group Listing information deemed reliable but not guaranteedThis IDX solution is (c) Diverse Solutions 2019. Label the bottle with tape. This is the total amount of acid requiring neutralization (by the tablet and the NaOH). The equation for the reaction is. 50oC was obtained for δT. Using the measured heat capacity of the calorimeter, the temperature change, and the values for the specific heat and mass of the final solution, the total heat released can be calculated using Equation 1 ( see above). Consider separate solutions of NaOH and KCl made by dissolving 100. 5M HCl solution instead of water. Shootvilla Camera Cage for Sony Alpha A6500 with Top Handle,Homedics Compact Percussion Massager with Heat HHP-285-HJ-THP,X96 Smart TV Box Android 7. experiments done at constant pressure. 0 gram/ml, and that the specific heat of the solution is that o. NaOH(s) Æ Na+(aq) + OH-(aq) ΔH solution = - 44. Enthalpy of Solution (Heat of Solution) Example. I know how to calculate molarity and volume but I think I need to incorporate enthalpy and capacity of heat in order to calculate the change in temperature. Calculate the heat (calories) produced by the solution of 3 g of NaOH Calculate the number of calories that. 5 grams of NaOH (or equivalent measure of KOH) with 400 ml of methanol for a concentration of 0. Q = heat evolved Q = [ delta U ] = (m) (C sub V) (T2 - T1) Q = (100. Consider the titration of 20 mL of a sample that is 0. Calculate the value (calories) for the heat of solution of 2. A standard solution is one in which the concentration is known accurately. Is it possible to obtain 2 liters of a solution of NaOH (Mw = 40) 1 M by diluting a solution containing 0,2 grams of NaOH in 100 ml of solution ? In order to prepare 2 liters of a 1 M solution we need 2 moles of NaOH, i. 700 mol/L HCl, both initially at 20. 250 MNOH () When these two solutions are mixed the acid and base should. (a) Calculate the molarity of the NaOH solution. A student measured the molar heat of neutralization of a monoprotic acid, HA(1. Ccal= qcal/ (Tmix-Tinitial) where Tinitial is the initial temperature of the cool water. In this experiment, we will test the pH of water and of several aqueous salt solutions to determine whether these solutions are acidic, basic, or neutral. The volume of NaOH solution required to neutralize 1. ) when the HCl solution is added to the calorimeter containing the NaOH solution. By submitting this form with your telephone number you are consenting for Kathy Caviness to contact you even if your name is on a Federal or State "Do not call List". 0 M solutions of each, or you might burn your eyeballs out. It is misci-ble with water at any ratio. Find the atomic mass of KMnO 4: (39. 50 mol NaOH(s) is dissolved in water? 1) Analyze - List the knowns & the unknown. Enthalpy of Solution (Heat of Solution) Example. Calculate the number of moles of HCl, n H +, to four sigificant figures using the volume and molarity of the HCl solution. (Hint: the mass of the solution is the sum of grams of water + grams of NaOH. 00 kg of water is heated from 22. 4 is added to 50 mL of 1. This lab demonstrates the principle of Hess's Law - if several reactions add up to produce an overall reaction, then the heat transfers of the reactions will add up to the value of the heat. Answer: mole NaOH= concentration x volume 1x10-1 x 5 x10-2 = 0. I need to know the specific heat of sodium hydroxide for a chem lab I'm doing at school. Citations are the number of other articles citing this. 250 MNOH () When these two solutions are mixed the acid and base should. the total volume of the solution remained in the cylinder is 65 ml, and the Weight the wide 100 mL-graduate cylinder with the remaining solution. The Complete Sodium Hydroxide Density-Concentration Table Calculator This calculator calculates for concentration or density values that are between those given in the table below by a process called interpolation. Since the primary purpose of this project is the replication of results, we require that you follow our methodology (attached) as closely as possible. 25 g of NaOH But I keep getting answers wrong for this question. Assume that the density of the mixed solutions is 1. 25 g of sodium hydroxide (NaOH) was dissolved in 150. Calculate the heat (calories) produced by the solution of 3. Calculate the total heat released in the reaction, in J, assuming that the specific heat capacity of the solution is the same as that of pure water, 4. 62kJ/mol(In case you didn’t know, that’s a value that’s been calculated. A pH between 12 and 13 gives the most stable solution. • Δ T : ∆T is the change in temperature of the solution (T f – T i ). Calculator for Making Sodium Hydroxide Solution This calculator calculates the amounts of two starting solutions of given concentration needed to be mixed together to obtain the final solution requirements. NaOH and H2O reaction to form Na+ and OH- ions in solution. An infinitely dilute solution is one where there is a sufficiently large excess of water that adding any more doesn't cause any further heat to be. In Part B, the moles of NaOH are calculated from the volume and the molarity of the NaOH solution used. im still looking how to find the heat of reaction for both actually. Use the specific heat of water, 4. Properties of sodium hydroxide NaOH: Caustic soda, caustic. 67 mL of your NaOH solution. A standard solution is one in which the concentration is known accurately. Start Virtual ChemLab and select Heat of Reaction: NaOH + HCl from the list of assignments. B) Calculate the pH of a 0. The heat absorbed by the calorimeter system, q. Buffer Solutions Example: Calculate the concentration of H +and the pH of a solution that is 0. Your oil volume of 200 ml is 1/5th of one litre, meaning that you should reduce the usual 20% methanol volume proportionately, to 40 ml. So basically, i. The heat capacity of HCl solution is less than that of water. He carefully measures 4. First, number of moles(n) of dissolved NaOH should be calculated. This is a multiple-step problem: 1) the grams \(\ce{NaOH}\) is converted to moles; 2) the moles is multiplied by the molar heat of solution; 3) the joules of heat released in the dissolving process is used with the specific heat equation and the total mass of the solution to calculate the \(\Delta T\); 4) the \(T_\text{final}\) is determined. g, assume the calorimeter does not absorb any heat and the density of the solution is 1. 2 kJ/mol Thus, ΔH2 = -50. The standard heat of forination of sodium ions in aqueous solution from the following data: Heat of formation of NaOH) at 25°C = - 470. The enthalpy change in this process, normalized by the mole number of solute, is evaluated as the molar integral heat of dissolution. Medicare Eye Exam , the Florida HMO, came in to #140 in the list of preferred healthiness blueprints with a credit of 82. PRE-LABORATORY ASSIGNMENT EXPERIMENT 6 1. The integral heat of dissolution is defined for a process of obtaing a certain amount of solution with a final concentration. Calculate the molar enthalpy of reaction for reactions (3) and (4). decrease results. 0 M NaOH are mixed in a calorimeter to the the temperature change when 50 mL of 3. Examine the tip of the buret carefully to be sure that there are no air bubbles in it. Phosphoric acid, H3P04, is a triprotic acid with K al = 7. This is a multiple-step problem: 1) the grams \(\ce{NaOH}\) is converted to moles; 2) the moles is multiplied by the molar heat of solution; 3) the joules of heat released in the dissolving process is used with the specific heat equation and the total mass of the solution to calculate the \(\Delta T\); 4) the \(T_\text{final}\) is determined. Close the lid of the calorimeter with thermometer in it 9. 200 M solution. Consider the titration of 50. Once cooled, add. 18 J/g°C, respectively. Calculate the density of the solution which is at the same time equals that of the cylindrical specimen. 6°C after being mixed in the calorimeter. Calculate the change in temperature for the system. 420 M NaOH solution required to titrate the following solutions: a. Both solutions were origi- nally at 24. The product Na2SO4 is aneutral salt. 3M NaOH = Xg NaOH in 1000 mL water = > X = 0. , adding table salt to water), the solute could exist in another phase. Assume that the density of the mixed solutions is 1. 50% (w/w) Sodium hydroxide means that 100 grams of solution contains 50 grams of NaOH. 00 g of water a value of 10. The heat absorbed by the calorimeter system, q. 216 E Front Street in Traverse City, MI is for Lease - MLS ID 1857303. Calculating the Enthalpy Change in Solution Formation How much heat (in kJ) is released when 2. Swirl to mix. 5 J of heat is added to a 15. pOH = -log[OH-] = -log(6. 500 M H3PO4 solution. 5 deg = 1050 calories (Note: the heat went to raise the temperature of 102. Medicare Eye Exam , the Florida HMO, came in to #140 in the list of preferred healthiness blueprints with a credit of 82. 24 J/K), the temperature rises from 25. are adding drops of NaOH into the flask). 9 kJ/mol Na(s) + 1/2 O2(g) + 1/2 H2(g) --> NaOH(aq, 1 m) = -469. The heat capacity of a substance is the amount of heat required to change its temperature by one degree, and has units of energy per degree Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!. 04 mole = 2. What mass of NaOH was in the sample? We can calculate the number of moles of HCl reacted: # mol HCl = (0. Question When 3. 6 g NH3 in 81. (b) In the same calorimeter, a neutralization reaction was carried out wherein the mass of the solution was 100. Add about 450 mL of distilled water to about 150 mL of NaOH (aq) solution provided (note the approximate concentration of the NaOH(aq) from the bottle). Data Treatment Using a graphing program, such as EXCEL, find ∆T for the reactions performed in the coffee-cup calorimeter by plotting temperature versus time and extrapolating from the graph (as in. The balanced equation will appear above. 0 g of water in a coffee-cup calorimeter (see figure), the temperature drops from 23. Using a funnel, fill the buret with the provided NaOH solution. Heat of solution problem can't get the right answer. 75 g of NaOH Hint: Remember that the reaction is exothermic. 0ml of the solution are needed to neutralize 17. Working quickly, note the time (time = 0 s. This is called alkaline hydrolysis of esters. 50oC was obtained for ΔT. 01852 mol HX (c) Calculate the molecular weight of HX. Calculate the heat of reaction, i. Using a funnel, fill the buret with the provided NaOH solution. Step 1: What is left in solution?. Intended for Advanced Chemistry students in high school or college level first year chemistry. The concentration of a chemical solution refers to the amount of solute that is dissolved in a solvent. 1M NaOH = 40g NaOH in 1000 mL water 0. White, hygroscopic, melts and boils without decomposition. 00g of NaOH, then he adds it to 400. 25 g of NaOH solution. So we can construct a conversion factor to convert to number of moles of NaOH reacted:. Enthalpy of Neutralization Objective In this experiment you will determine the molar enthalpy of neutralization of an acid. 00 g of water a value of 12. The density of 3 molal solution of NaOH is 1 110 g/ml Calculate the molarity of the solution - Chemistry - NCERT Solutions Mass of 3 moles of NaOH = 3 x molar. T The graph also shown these results, that curve first reaches to peak. 0124 mol = 12. What temperature change occurs when solid sodium hydroxide dissolves in water? « on: 16/10/2009 22:44:26 » if you put 5. 50oC was obtained for ΔT. A student mixed 50. This gives a ratio of 5 drops iron solution to 15 drops of the NaOH solution. Example: Calculate the equivalent weight of acid or base for the given details. 1000 M solution of NaOH to do a titration. HCl(aq) + NaOH(aq) → NaCl(aq) + H 2 O(l) + heat What is the energy as heat lost or gained by the solution? First assume that the densities of the solutions and the specific heat capacities are approximately those of water - 1g/ml and 4. What is the specific heat of NaOH and = 0. Calculate the number of moles of water produced and record it on line 11. 4g of solid NaOH are dissolved in water and then diluted the mixture upto 250cm 3. This is the heat gained by the water, but in fact it is the heat lost by the reacting HCl and NaOH, therefore q = -2. The volume of NaOH solution required to neutralize 1. The independent variable is the amount of substance and the actual substance used in the reaction. mol H 2 SO 4 = 1. 75 g of NaOH Hint: Remember that the reaction is exothermic. 724 moles of H 2 SO 4 in 2. (Normally phenolphthalein turns pink in basic. Heat the analyte solution for 5 minutes to finalize the HCl (aq) / CaCO 3(s) reaction. Because the reaction is exothermic, your answer. Warmer air means all kinds of other changes to the climate system, from stronger storms and wetter monsoons to rising seas. 2) Convert average volume from step 1 from ml to liters. 25 g of NaOH. Since the primary purpose of this project is the replication of results, we require that you follow our methodology (attached) as closely as possible. 00 g of water a value of 10. Because the reaction is exothermic, your answer. 2 kJ/mol Thus, ΔH2 = -50. Calculate thermodynamic data for salt and fill the Table 4. ) Calculate the volume of 0. Dilute to the mark with distilled water. 4846 M (b) Calculate the number of moles of HX in a 50. It is best to fill the buret an inch or two above the zero line and then open the stopcock to drain. The heat of neutralisation between a strong acid and a strong base is -57. 18J/g C, how much heat is evolved by this reaction in kJ? Calculate the pH after 0. Calculate the heat released by the reaction in terms of kJ/mol NaOH. 5) An approximately 0. 0 mL x 100 = 1. Baker) as described above, and stored under helium. Then, find the total mass of the reactants by adding all of their individual masses together. A student is measure the heat of solution for NaOH. Middle crystallizing dish contains water as a comparison measure. Calculate the molarity of the sodium hydroxide solution. Determine the heat of solution of NaOH given the thermodynamic equations below. We used the variation of temperature and the mass each of solution to calculate the heat which was released or absorbed in the reaction using the formula Q=MC∆T. I thought calories would be calculated by multiplying (delta T)(mL water)(specific heat of water) which would be 290 calories but that is incorrect. 0°C before the reaction, and reached a maximum temperature of 34. 10 M solution of NaOH. Calculate the temperature change, ∆T, for each of the reactions. The enthalpy of solution is expressed in KJ/mol at constant temperature. assumes that no heat is lost to the calorimeter or the surroundings. Those two acids are hydrochloric acid and acetic acid. A pH testing strip will tell you that NaOH (sodium hydroxide) is a strong alkaline, but to calculate its exact pH, you have to work out its molarity first. Calculate the number of calories that would be produced if one mole of sodium hydroxide was dissolved. Replace the lid with the thermometer in place, and gently swirl the assembly to mix. NaOH solution into the HCl calorimeter, replace the lid and thermometer, and swirl the calorimeter to mix the solutions. 00 g of NaOH. Assuming that the specific heat of water is 4. 00 o C was obtained for ΔT. 00, V e, and 26. So, the heat of HCl-NaOH solution is 3214. Use uppercase for the first character in the element and lowercase for the second character. Assuming all solutions have a density of 1. ---ammonia is a base---so pH will increase as reaction proceeds; unless soln is buffered!. 50 M [K a (HOAc) = 1. stands for the specific heat of the reaction solution (in. Steps cause other wise i cant do the other examples i have! 10 points!-Okay, we need to know how many moles of NaOH we actually have, and this is given by mol=mass/mr. The chemical equation allows us to calculate the concentration of a solution of HCl by titration with the base NaOH (where the concentration of NaOH is accurately known). Assume that the density and specific heat of the dilute aqueous solution are the same as those of H2O and. 11 When copper is added to a solution of silver ions, the following equilibrium is established. 0 M of HCl and 50 mL of 3. 0 mol NaOH 1 L mol NaOH solution 1 mol OH 1 mol NaOH 0. 00 mL of a 2. 5 ml, respectively. — Dataonheatsofneutralization [FromthedataofGillespie,Lambert,andGibson] Solutionformed Tempera-tureof reaction =initial tempera-ture Average tempera-ture Heatca-pacityof saltsolu-tionat average tempera-ture AH,heat absorbed Calculationsby presentauthor Illt'Ill Heatca-pacityof saltsolu-tionat average tempera. Thermodynamics - Enthalpy of Reaction and Hess's Law Introduction: The release of absorption of heat energy is a unique value for every reaction. If we want to assign a direction of heat flow in this question, then we would add a (+) to 49. NaOH –HCl + NaOH → NaCl + H 2 O added enough solution to make the How would you calculate the pH at this. Calculate the value (calories) for the heat of solution of 4. I know how to calculate molarity and volume but I think I need to incorporate enthalpy and capacity of heat in order to calculate the change in temperature. 01852 mol HX (c) Calculate the molecular weight of HX. (b) In the same calorimeter, a neutralization reaction was carried out wherein the mass of the solution was 100. 0g CH3CooN/1 Mol CH3 CooN=. 22 gram at 25°C. How much heat (calories) produced by the solution of 3. Heat released = (5) x (9) x (8). The first part, I found the molarity of the solution to be 0. 75 g of sodium hydroxide (NaOH) was dissolved in 150. The standard heat of forination of sodium ions in aqueous solution from the following data: Heat of formation of NaOH) at 25°C = - 470. Compare the temperature change when 50 mL of 1. 0 grams per liter (gpl) excess NaOH. HCl(aq) + NaOH(aq) → NaCl(aq) + H 2 O(l) + heat What is the energy as heat lost or gained by the solution? First assume that the densities of the solutions and the specific heat capacities are approximately those of water - 1g/ml and 4. assumes that no heat is lost to the calorimeter or the surroundings. !!In principle,asolutioncanbeasolid. 10), we can calculate ΔH from ΔU and vice versa, when Δ(PV) is known. We also have the balanced chemical reaction between HCl and NaOH: HCl + NaOH → NaCl + H 2 O. Rinse 10 mL pipet with solution and pipet 10. Concentration Units: Solved Problems. Answer the questions on the reverse side of your data sheet. Forest Service, tree canopies in. 67 M HCl with 75 of 6. The liquid may thicken somewhat. 0 mL of HCl (aq) and 75. Determine the concentration of acetic acid of vinegar, in terms of % (m/m). What is the pH of a 0. 25 g of NaOH But I keep getting answers wrong for this question. This lab demonstrates the principle of Hess’s Law – if several reactions add up to produce an overall reaction, then the heat transfers of the reactions will add up to the value of the heat. Show your work. its mass (𝐦𝐠𝐜 )310. 00 g of sodium hydroxide (NaOH) was dissolved in 150. Heat energy = cmu, where m is the body mass, u is the temperature, c is the specific heat, units [c] = L 2 T −2 U −1 (basic units are M mass, L length, T time, U temperature). [See the sample calculations for more information regarding the calculations of ΔH and q. I am trying to dilute a conc acid stream at 220 litersperhour to a water stream at 2000 litersperhour. 9 kJ·kg−1·K−1 and a mass of 1. 00 g of water a value of 10. The first part, I found the molarity of the solution to be 0. Physically, this means that it takes the value of the Cp in energy to raise the calorimeter by 1 ° C. After adding the NaOH solution to the coffee cup and stirring the mixed solutions with the thermometer, the maximum temperature measured is 32. Calculate the value (calories) for the heat of solution of 2. Calculate the mass of acetic acid (HC 2H 3O 2) that would be neutralized by 28. The enthalpy change in this process, normalized by the mole number of solute, is evaluated as the molar integral heat of dissolution. Third, you need to approximate that the solution has the heat capacity of water, which is 4. Once the titration is complete you may dispose of the contents of the Erlenmeyer flask down the sink. Calculate the molarity of an acetic acid solution if 34. Neither of these chemicals has any nutritional uses, as both would be extraordinarily dangerous to take internally. 3) Using the definition of Molarity (equation 3), calculate moles of NaOH at end point using answer to step 2 and concentration of NaOH solution. Calculate thermodynamic data for salt and fill the Table 4. Welcome! Chemistry-Reference. 18 K-1 g-1 ignoring the heat absorbed by the container, therometer, stirrer etc. if the reaction is carried out in aqueous solution in a coffee cup calorimeter, the heat lost to the surroundings will be negligible, so we can calculate Q Sample Calculation: The Molar Heat of Solution of NaOH in Water 1. 024L NaOH x 0. 5 story with one main floor bedroom and two second floor bedrooms. 046 g of sodium hydroxide is dissolved in 100. Heat of solution problem can't get the right answer. To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. NaOH (s) -> Na (aq) + OH (aq) Assume that the specific heat of the solution is the same as that of pure water. 0 mL of HCl (aq) and 75. When the reaction is finished, the system contains two substances, the calorimeter itself and the aqueous solution, and there is a heat associated with each component. IV Data and Calculation 4. Thermodynamics - Enthalpy of Reaction and Hess's Law Introduction: The release of absorption of heat energy is a unique value for every reaction. Start Virtual ChemLab and select Heat of Reaction: NaOH + HCl from the list of assignments. Calculate the number of moles of water produced and record it on line 11. 2) Calculate – Solve for the unknown. ? For the reaction of 8. This is because the neutralization reaction that occurs involves a 1:1 stoichiometric ratio of HCl to NaOH, so the moles of NaOH added is equal to the amount of HCl left in solution. Prepare the standardized NaOH (aq) solution in a 50.