Two solutions initially at `25^(@)C` were mixed in an insulated bottle. One contains `400mL` of `0.2N` weak monoprotic acid solution. The other contains `100mL` of `0.8N NaOH` solution. After mixing the temperature rises to `26.17^(@)C` . Calculate the heat of neutralisation of weak acid with `NaOH`. Assume density of final solution `1.0 g cm^(-3)`. and speicific heat of final solution `4.2J g^(-1)K^(-1)`.
