Question

Teeth and bones are composed, to a first approximation, of calcium phosphate, Ca3(PO4)2(s). The Ksp for this salt is 1.3*10^-32 at 25°C. Calculate the concentration of calcium ion in a saturated solution of Ca3(PO4)2.

Answer 1

it should be 25°C not 25°C

Answer 2

Ca3(PO4)2 ==> 3Ca^+2 + PO4^-3

Ksp = (Ca^+2)^3*(PO4^-3)^2
If x = solubility of Ca3(PO4)2, then 3x is the concn of Ca^+2 and 2x is the concn of PO4^-3
Substitute th 3x and 2x into the Ksp expression, solve for x, then 3x will be the (Ca^+2)

Answer 3

should it be 0?

Answer 4

is the answer 0?

Answer 5

3.3x10^-7