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Calculate pH at which an acid indicator HIn with concentration 0.1 M changes its colour ( K a for HIn = 1 × 1 0 - 5 ).

Correct answer

5

Step-by-step solution

Indicator equation is p H = p K I n + log ⁡ I n - H I n Colour change takes place when [ I n - ] = [ H I n ] i.e., when p H = p K I n = 5 .

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