AP Chemistrymediummcq1 pt
Calcium forms Ca²⁺ ions and the phosphate ion carries a 3- charge. What is the formula of calcium phosphate?
A.Ca3(PO4)2
B.CaPO4
C.Ca2(PO4)3
D.Ca3PO4
Explanation
Core Concept
Balancing +2 against -3 needs a common multiple of six: three calcium ions deliver +6 and two phosphate groups deliver -6, canceling exactly. Parentheses keep each PO₄ unit intact while the outside subscript distributes over all five atoms within. Charge neutrality alone fixes the subscripts.
Correct Answer
ACa3(PO4)2
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