Indicators are compounds that change color with pH. Most indicators are actually

Question

Indicators are compounds that change color with pH. Most indicators are actually weak acids that are one color when protonated and another color when ionized: Thymolphthalein is an indicator that changes color over a range from pH = 9.3 to pH = 10.5. What is Ka of thymolphthalein? Express your answer to one significant figure. Bromocresol green, Ka = 2.0 times 10-5, is yellow in its protonated form (HX) and blue in its ionized form (X-). At what pH will bromocresol green be a perfect green color? Express your answer to one decimal place.

Explanation / Answer

Part A: 1*10^-10

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