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Aim: To explain how the enthalpy change of neutralisation can be used to determine the relative strength of an unknown acid. Provided Information: Relative Formula Mass: 135 Appearance: White crystalline solid Properties: Very soluble in water Monoprotic (monobasic): An acid that has only one acidic hydrogen atom in its molecules; common examples are hydrochloric acid (HCl) and nitric acid (HNO3). Prediction and Scientific Background: Standard Molar Enthalpy of Neutralisation (/\Hn,) is the enthalpy change per mole of water formed in the neutralisation of an acid by an alkali, (298K and 1 atm). * Unknown Acid (aq) + NaOH (aq) --> Salt (aq) + Water (l) * In aqueous solution, strong acids and bases are completely dissociated and Hneut is approximately equal to -57.9 kJ mol-1. This neutralization process corresponds to the reaction: H+ (aq) + OH- (aq) --> H2O (l) * For weak acids, this enthalpy change is less exothermic because some input of...

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