What is the formula for the compound composed of calcium and phosphate?

1 Answer
Jun 23, 2016

Answer:

#CaHPO_4# or #Ca_3(PO_4)_2#

Explanation:

Calcium phosphates are a very broad church. I just read that the mineral apatite, which is the phosphate we put on our gardens as fertilizer is #Ca_5(PO_4)_3X# #(X=X^(-), HO^-)#.

Of course the phosphate ion, #PO_4^(3-)# is quite a strong base, and in aqueous solution exists as #HPO_4^(2-)#.