WAEC Chemistry 2018 Theory — Question 16

Model answer

(i) Enthalpy of neutralization is the heat released when one mole of H⁺ ions from an acid reacts with one mole of OH⁻ ions from a base to form one mole of water. (ii) Measure known volumes and concentrations of KOH and HCl separately and note their average initial temperature. Mix them in a calorimeter and record the maximum temperature reached. Using the temperature change, the mass (density ≈ 1gcm⁻³) and the specific heat capacity of water, the heat evolved (and hence the enthalpy of neutralization) can be calculated.