How do Ca2+ and (PO4)3− combines to make an electrically neutral compound?
A
Three Ca2+ ions combine with two (PO4)3− ions
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B
You add all of the electrons together and divide by two.
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C
Two Ca2+ ions combine with three (PO4)3− ions
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D
Four Ca ions combine with two P ions and eight O ions
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E
None of the above
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Solution
The correct option is A Three Ca2+ ions combine with two (PO4)3− ions 3Ca2++2PO3−4→Ca3(PO4)2 ∴ 3 Ca2+ ions combines with 2 (PO4)3− combine to make an electrically neutral compound by cross multiplication of their charges.