The pH indicator dye phenolphtalein has three forms A, B, C depending on the pH of the solution. Which one among three forms is responsible for its characteristic pink color? And at which pH range the form appears? НО Select one: O O .OH a. A is pink color, between pH 8.2 b. C is pink color, above pH 13 c. B is pink color, between pH 10 and pH 13 HO но- C e OH

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