an indicator has a ka of..help please An indicator has a Ka of 3.25 Times 10-7.0

Question

an indicator has a ka of..help please An indicator has a Ka of 3.25 Times 10-7.00. In its acidic form, the indicator is yellow, and in its basic form, it 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 4.14 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 9.61 and that solution is titrated with a strong add, at what pH should the analyte solution START to change colors?

Explanation / Answer

Answers: 7, 7 and 7

For all your questions answer is same -- pH 7

pKa of that indicator is around seven and it's appearing like Bromothymol blue (name doesn't matter here).

Bromothymol blue is changing colour around pH 7 only.

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