Gen Chem Destroyer Question 103

[kgupta3]

I had a quick question. The problem asks to finds the calcium concentration in calcium phosphate given the Ksp. What I'm trying to figure out is how to write out Calcium Phospate. The answer shows it like this: Ca3(PO4)2.

How would I know what the coefficients are for Ca and PO4 when all I'm given is the name of the compound: calium phosphate?

Sorry this might be a dumb question..

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[PooyaH]

You need to know the oxidation numbers of Ca and PO4.

Ca= +2 & PO4 = -3 so the formula would be X3Y2 = Ca3(PO4)2

 

[kgupta3]

aaaah yes of course!! Thanks man.