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Which is the correct formula of calcium phosphate (phosphate is $PO X_{4} X^{3 -}$ )?

A $Ca X_{2} (PO X_{4}) X_{3}$
B $CaPO X_{4}$
C $Ca X_{3} (PO X_{4}) X_{2}$
D $Ca X_{3} (PO X_{3}) X_{2}$

Answer: C

Calcium is

Ca X^{2 +}

and phosphate is

PO X_{4} X^{3 -}

. Equalising charge needs

3 \times (+ 2) = 2 \times (+ 3) = 6

, so three Ca and two phosphate groups:

Ca X_{3} (PO X_{4}) X_{2}

.

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