A 25.0 mL sample of a solution of an unknown compound is titrated with a 0.115 M NaOH solution.The titration curve above was obtained.The unknown compound is ________.
A)a strong acid
B)a strong base
C)a weak acid
D)a weak base
E)neither an acid nor a base

Question

Quizplus · Accepted Answer

The equivalence point occurs at a pH of approximately 8, which is higher than the pH of a strong acid (pH 1-3) and lower than the pH of a strong base (pH 11-14). This indicates that the unknown compound is likely a weak acid.

A 250 ML Sample of a Solution of an Unknown Compound