A student titrates a monoprotic weak base with a strong monoprotic acid and carefully…
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A student titrates a monoprotic weak base with a strong monoprotic acid and carefully records the pH at the stoichiometric (equivalence) point.
Parts:
(a) Identify all major chemical species present in the solution at the equivalence point.
(b) Explain, in terms of chemical equilibria, why the pH at the equivalence point of this titration is expected to be lower than 7 rather than neutral.
(c) Describe qualitatively how the magnitude of the base-dissociation constant Kb of the original base influences the exact pH value observed at the equivalence point.