Question #eaed5

1 Answer
P dilip_k
Feb 28, 2016

trying to clear

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

google image

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

pls, inform if cleared

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