Please help with a solubility True/False question!!?

Calcium phosphate, Ca3(PO4)2, has a solubility of S molL^-1 in pure water. Which of the following statements is/are correct?


1) At equilibrium, [Ca^2+] = S





2) At equilibrium, [PO4^3炉] = 2S





3) Ksp = 6S^5





4) Ksp = 108S^5








ALSO.. if you don't mind could you please help me with this solubility question? PLEASEE Calculate the solubility, in molL^-1, of barium sulfate, BaSO4, in a 0.0232 M solution of ammonium sulfate, (NH4)2SO4 .


Ksp (BaSO4) = 1.1 x 10 ^-10Please help with a solubility True/False question!!?
[Ca3+]= 3S


[PO43-]= 2S


Ksp = (3s)^3( 2S)^2 = 108 S^5





1.1 x 10^-10 = x( x+ 0.0232)


x = molar solubility = 4.7 x 10^-9 M