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Question

The selected indicator for acid-base titration is one which has $p K_{l n} = p H$ (at point) $\pm 1$ .

A

True

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B

False

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Solution

The correct option is A True
An acid & base indicator is a substance which changes it's colour within limits with variation in pH of the solution to which it is added. Indicators, in general are either organic weak acids or weak bases with a characteristics of having different colours in the ionized and unionized form e.g. phenolphthalein is
a weak acid (ionized form is pink and unionized form is colourless).

In general pH range of indicator lies between
$p K_{l n} = p H$ (at point) $\pm 1$

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