Heat of displacement (Calculation)

To determine the heat of displacement of copper from a copper (ll) sulphate solution by zinc.

Procedure :

1. Measure 25 cm³ 0.2 mol dm^-3 copper(ll) sulphate solution and pour into a polystyrene cup.

2. Put the thermometer into the copper(ll) sulphate solution. Record the initial temperature,

3. Add half a spatula of zinc powder (in excess) quickly into copper(ll) sulphate solution.

5. Stir the mixture with the thermometer and record the highest temperature achieved.

Result :

Initial temperature of copper(II) sulphate solution        =  30.0 ⁰C

Highest temperature of the mixture                              =  40.0 ⁰C

Calculate the heat of displacement of copper from a copper (ll) sulphate solution by zinc.

[ Specific heat capacity of solution : 4.2 J g^{-1 0}C^-1 . Density of solution : 1 g cm^-3 ]

(Ans: - 210 kJ mol^-1)