Question

What type of titration has an equivalence point above $pH=7$?

• A. Weak acid/strong base
• B. Strong acid/strong base
• C. Weak acid/weak base
• D. Weak base/strong acid

Answer 1

The correct option is D Weak base/strong acid

Weak base/strong acid titration has an equivalence point above $pH=7$.
At the equivalence point, a salt of a strong acid with the weak base will be formed. The products of hydrolysis of this salt will determine the $pH$ of the solution. The hydrolysis of such salt will produce weak base and a strong acid. The weak base is dissociated to a small extent giving few hydroxide ions. The strong base is completely dissociated giving a large number of protons. Hence, the hydrogen ion concentration is greater than hydroxide ion concentration and the solution is acidic with $pH<7$.