Question

Pre-Lab Questions: 1. Write the balanced molecular equ equation for the neutralization reaction between lar equation, the total ionic equation and the net lonic on between HCl(aq) and NaOH(aq). a) molecular equation b) total ionic equation c) net ionic equation 2. In this experiment you will use two different concentrations of HCI and NaOH (1,00 M solutions in Part A and 0.500 Min Part B). a) How would you expect the heat of neutralization to differ for the two parts? b) How would you expect the molar heat of neutralization to differ? Explain. Enthalpy of Neutralization

Answer 1

1) a) The reactions that occur are:

NaOH + HCl = NaCl + H2O

b) Na + + OH- + H + + Cl- = Na + + Cl- + H2O

c) OH- + H + = H2O

2) a) The heat of neutralization will be greater in Part A, than in Part B.

b) The molar heat of neutralization will be the same.

3) a) The reagent moles are calculated:

n NaOH = M * V = 2 M * 0.01 L = 0.02 mol

n HCl = 2 M * 0.01 L = 0.02 mol

b) Both are limit reagents. Well, both have the same amount of moles and the same stoichiometric coefficient.

c) 0.02 mol of NaCl are formed.

d) The resulting volume is 20 mL.

e) The molarity is calculated:

[NaCl] = n / V = ​​0.02 / 0.02 = 1 M

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