The human eye is sensitive to colour differences of indicator only when the ratio [In^(-) ] // [Hin] is greater then 10 (or)smaller than 0.1. What should be the minimum change in the pH of solution of observe a complete colour change . (pK_(In) =5).

The human eye is sensitive to colour differences of indicator only whe

1.	The human eye is sensitive to colour differences of indicator only when the ratio [In^(-) ] // [Hin] is greater then 10 (or)smaller than 0.1. What should be the minimum change in the pH of solution of observe a complete colour change . (pK_(In) =5).
Answer» `1.2` ` 1.4` ` 1` `2` SOLUTION :`pH " RANGE"=[PK_(I_n) -1, pK_(I_n) +1]` ` THEREFORE `change =2