A-LevelChemistryEquilibriaOct/Nov 2018Paper 4 Q419 Marks
Entropy is a measure of the disorder of a system. The enthalpy change of solution, ΔH°sol, of the Group 2 sulfates becomes more endothermic down the group. An aqueous solution of sodium hydroxide has a pH of 13.25 at 298 K. The Ka for ethanoic acid is 1.75 × 10⁻⁵ mol dm⁻³ at 298 K. Titration curves for two different acid-base reactions, M and N, are shown. [Figure showing two titration curves: reaction M (strong acid-strong base) and reaction N (weak acid-strong base)]
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