Question

Question #eaed5

Answer 1

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Explanation:

`H_3PO_4` is a tri-basic acid i.e. it has got 3 replaceable H atoms in its molecule as is evident from its structural formula below

In our equation one atom of the acid molecule has been replaced i.e.`H_2PO_4^-1`is contributed by the acid. So 2 of this ion will combine with one`Ca^(++)` forming `Ca(HPO_4)_2`

When two atoms are replaced then`HPO_4^-2` ion is formed and one of this divalent ion combine with one `Ca^(++)` ion forming `CaHPO_4`

Finally when 3 H atoms are replaced then `PO_4^-3` ion is formed and two of this ion combine with 3 `Ca^(++)` ions forming `Ca_3(PO_4)_2`

Brackets are used to separate the positive and negative groups / ions not equal in numbers

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