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If calcium hydroxide is mixed with phenolphthalein, what color does it make??

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and is calcium hydroxide an acid or a base?

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  1. Hello???   It's a hydroxide.  The Arrhenius theory of acids and bases says that any substance that dissolves in water to produce hydroxide ions is a base.

    Dissociation of calcium hydroxide in water.  

    Ca(OH)2(s) <==>  Ca++ + 2OH-

    But keep in mind that calcium hydroxide isn't very soluble in water.  It will quickly form a saturated solution.

    Therefore, in a solution of calcium hydroxide will turn phenolphthalein pink indicating a basic solution.

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