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26 July, 22:28

Explain why the chemical formula for calcium hydroxide, Ca (OH) 2 is not written as CaO2H2

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  1. 27 July, 00:56
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    The formula CaO₂H₂ correctly gives the relative number of each type of atom in the compound.

    But the OH group usually behaves as a unit. It doesn't fall apart.

    So chemists have agreed to write the OH group as a unit: Ca (OH) ₂.

    This shows that there are 1 Ca atom and 2 OH groups in a formula unit of calcium hydroxide.
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