Describe an experiement that can be used to determine the enthalpy of displacement reaction between zinc and copper sulphate

• Pipette 25cm³ of 0.1M copper II sulphate into a plastic cup
• Insert a thermometer and measure the initial temperature T₀⁰C
• Add excess zinc Powder (6g) to the cup, stir and determine the highest temperature T ⁰C of the mixture.
• Assuming the density of the solution is 1g per cm³ calculate the amount of heat liberated is calculated from

∆H = m c ∆T

= 25 x 4.18 (T – T₀) joules

• Moles of copper displaced = (25 x 0.1/1000) = 0.0025moles
• Displacement of 0.0025mole of copper II ions  produce                            [25 x 4.18 (T – T₀)] joules

Displacement of 1 mole of copper II ions would produce joule

{[25 x 4.18 (T – T₀)]/0.0025} joules

Enthalpy of displacement reaction between zinc and copper sulphate  =      {[25 x 4.18 (T – T₀)]/0.0025} Jmol^-1