Q19.42P - Chemistry: Molecular Nature Of Matter And Change

Question

What is the difference between the endpoint of titration and the equivalence point? Is the equivalence point always reached first? Explain.

Step-by-Step Solution

Answer

A point at which the amount of acid equals the amount of base is known as an equivalence point. An endpoint is the point at which an indicator changes color. To ensure that a complete reaction occurs, an equivalence point must occur first or concurrently with an endpoint.

Step 1: Define equivalence point

In a titration, an equivalence point is reached when the amount of titrant administered is sufficient to totally neutralize an analyte solution.

Step 2: Explanation

An equivalence point is a point on a curve when the amount of acid in a solution equals the amount of base.

An endpoint of a curve is a point at which an indicator changes color.

To signify a complete reaction, an equivalence point must always appear before a terminus. Depending on the pH of an analogous point, it can also be at the same place in a curve.