An indicator has a Ka of 6.25 times 10^-800. In its acidic form, the indicator i

Question

An indicator has a Ka of 6.25 times 10^-800. In its acidic form, the indicator is yellow, and in its basic form, it is blue. At what pH is the indicator most green (the color that is a mix of blue and yellow)? If that indicator is placed into a solution with a pH of 4.85 and that solution is titrated with a strong base, at what pH should the analyte solution START to change colors? If that indicator is placed in a solution with a pH of 10.32 and that solution is titrated with a strong add. at what pH should the analyte solution START to change colors?

Explanation / Answer

If the Ka of indicator,

Ka = 6.25 x 10^-6

the pH at which we would see green color a mix of acidic and basic would be,

5.2

when the indicator is placed in solution of pH 4.85, titrated with strong base, the pH at which it would show color change,

10.05

when the indicator is placed in a solution of pH 10.32 and titrated with strong acid, the pH at which it would show color change,

7.60

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