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An acid-type indicator "Hin" differs in ...

An acid-type indicator "Hin" differs in colour from its conjugate base `("Ind"^(Theta))`. The human eye is sensitive to colour difference only when the ration `["Ind"^(Theta)]//["Hin"]` is greate than `10` or smaller than `0.1`. What should be the minimum change in the `pH`of the solution to observe a complete colour change `(K_(a) = 1.0 xx 10^(-5))`

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Change on pH = 2
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