Phenolphthalein has a pK a of 9.7. It is colorless in its acid form and pink in

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Phenolphthalein has a pKa of 9.7. It is colorless in its acid form and pink in its basic form. For each of the values of pH, calculate [In]/[HIn] and predict the color of a phenolphthalein solution.

a. pH = 2.0

b. pH = 5.0

c. pH = 8.0

d. pH = 11.0

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