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pH Scale

The pH at the...

Question

The pH at the equivalence point of a titration may differ from $7.0$ because of

A

The self ionisation of water

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B

Hydrolysis of the salt formed

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C

The indicator used

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D

The concentration of the standard solution

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Solution

The correct option is C Hydrolysis of the salt formed
Salt hydrolysis affects the pH of the solution. Hence pH at the equivalence point of a titration may differ from $7$ due to salt hydrolysis.

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Q. The rapid change in

p H

near the equivalence point of an acid-base titration is the basis of indicator detection.

p H

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) and basic form (

I n^{-})

of the indicator by the expression :

In acid-base titration react rapidly to neutralise each other. Equivalence point is a point at which the acid and the base (or oxidising agent and reducing agent) have been added in equivalent quantities. The end point is the point at which the titration stops. Since the purpose of the indicator is to stop the titration close to the point at which the acid and base were added in equivalent quantities, it is important that the equivalent point and the end point be as close as possible. The indicator must change colour at a pH close to that of a solution of the salt of the acid and base. Significantly, the pH changes most rapidly near the equivalence point. The exact shape of a titration curve depends on

K_{a}

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The suitable indicator for the titration is

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H A

N a O H

slowly. The titration curve observed is given below.

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