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Question

What is the formula for calcium hydroxide?

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Solution

To make a neutral species, we simply balance the charges.

To balance the charge of the metal ion, Ca2+ we need 2 hydroxide ions 2×OH

We get the formula Ca(OH)2

Note that once you know the formula for calcium hydroxide, you know the formula for the hydroxides of ALL the Group 2 metals, i.e.Ba(OH)2,Sr(OH)2

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