Experiemnt DEnthalpy of Reaction

Pre-Laboratory Assignment

Name: Chui Wai

Student ID: 2012600412

Group Member:

Date of Experiment: 27/03/2014 Demonstrator:

Complete the following questions before the lab session and submit this assignment to your

demonstrator before beginning your experiment.

Questions

1 Enthalpy is a state function. Explain what is meant by the term “state function”.

A state function is a property whose value does not depend on the path taken to reach

that specific value.

2 Sketch labelled energy profiles for the following reactions. Indicate the reactants and products.

A) CH3COOH(aq) + NaOH(aq) CH3COONa(aq) + H2O(l)

B) H2O(l) H2(g) + 1/2 O2(g)

CH3COONa(aq) + H2O(l)

CH3COOH(aq) + NaOH(aq)

H < 0

Ea

Energy

Progress

3 Why is it necessary to keep the CH3COONa(s) in a tightly closed container?

CH3COONa absorb water molecules from the air and dissolve in it. So keeping it in a tightly closed container can maintain the the particle dry.

H2(g) + 1/2 O2

H2O(l)

H > 0

Ea

Energy

Progress