A chemist plots a titration curve tracing the pH of a solution as is continuously added to of . Visually, the curve begins at a high pH, displays a buffer region, and then plummets vertically. Where w

Question

A chemist plots a titration curve tracing the pH of a solution as $0.1 	ext{ M } HCl$ is continuously added to $50 	ext{ mL}$ of $0.1 	ext{ M } NH_4OH$. Visually, the curve begins at a high pH, displays a buffer region, and then plummets vertically. Where will the sharp, vertical equivalence point visual drop be centered on the pH axis?

Prashant Kotian · Accepted Answer

Correct answer: C. The visual titration curve of a weak base () against a strong acid () starts high (basic), gradually drops through a basic buffer region (), and undergoes a sharp, steep visual drop at the equivalence point. Because the resulting salt () undergoes cationic hydrolysis, the solution at the exact equivalence point is acidic. Therefore, the vertical drop is centered in the acidic region (typically around pH 5).

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