Which statement is true of phenolphthalein? a. it can be used in combustion reactions. b. it is colorless in the presence of an acid and pink in the presence of a base. c. it gives you the exact ph of a solution. d. it is colorless in the presence of a base and pink in the presence of an acid. e. it is called a decomposition indicator.

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Which statement is true of phenolphthalein? a. it can be used in combustion reactions. b. it is colorless in the presence of an acid and pink in the presence of a base. c. it gives you the exact ph of a solution. d. it is colorless in the presence of a base and pink in the presence of an acid. e. it is called a decomposition indicator.

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B is the right choice.

Phenophtalein is an indicator commonly used in acid base titration experiments. Indicators are substances that undergo specific, detectable changes when the pH of their solution changes. Indicators show color change depending on the pH of the solution in which they are obtained. They are usually weak bases and acids that are capable of decomposing and forming ions when dissolved in water. There are different types of indicators and phenophthalein is one of them. Phenophtalein is colorless in acidic solution and pink in basic solutions.