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QUESTION

# What is the formula for calcium hydroxide?

Calcium is from Group 2 and commonly forms the Ca^(2+) ion. Hydroxide ion, HO^-, is singly, negatively charged.

To make a neutral species, we simply balance the charges. To balance the charge of the metal ion, Ca^(2+), we need 2 hydroxide ions, 2xxOH^-.

We get the formula Ca(OH)_2. Capisce?

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. Are you with me?