POST LABORATORY QUESTIONS 1. a. For the neutralization reaction that you carried

Question

POST LABORATORY QUESTIONS 1. a. For the neutralization reaction that you carried out between HCI (aq) and NaOH (aq). how many moles of NaCI (aq) were produced? b. For the neutralization reaction that you carried out between HCI (aq) and NaOH (s), how many moles of NaCI (aq) were produced? 2. a. Calculate AHna for the neutralization of HCI (aq) and NaOH (aq) in kilojoules per mol of NaCl b Calculate 1m for the neutralization of HCI (aq) and NaOH (s) in kilojoules per mol of NaCI 3. a. Using your experimental data and Hess's law, what is the enthalpy of reaction for NaOH (s) NaOH (aq)? b. Is this reaction endothermic or exothermic? CHEM1414-AY-2017-2018 8-12

Explanation / Answer

1.

We have to write the reaction between them first:

NaOH + HCl -----> NaCl + H2O

this equation always shows the relation in moles

1 mol NaOH reacts with 1 mol HCl to form 1 mol NaCl

moles can be obtained = mass/ molar mass

or moles = molarity x volume in litres

2.

We need to find the heat released per mole by looking at the change in temperature of solution

mCpT = heat absorbed by solution

from here heat of neutralization can be obtained

mCpT = H x n

n = no. of moles of NaOH reacted

H = molar heat of neutralization

Cp = heat capacity of water

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