An indicator has a Ka of... Wrong answers:7 An indicator has a Ka of 3.25 x 10 7

Question

An indicator has a Ka of...
Wrong answers:7 An indicator has a Ka of 3.25 x 10 700. 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)? Number 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? Number 0 If that indicator is placed in a solution with a pH of 9.61 and that solution is titrated with a strong acid, at what pH should the analyte solution START to change colors? Number O Previous Check Answer 0 Next Exit

Explanation / Answer

Color change will occue when [H+] = [OH-]
That is at pH =Pka
pH = pKa
     = -log Ka
     = -log (3.25*10^-7)
     = 6.49

Answer of all parts should be 6.49

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