The dissolution of calcium sulfate forms equal amounts of calcium ions and sulfate ions.
Then we can solve for the molarity of calcium sulfate that would be soluble.
2.4 x 105- = (x)*(x)
Solving for x we get [Ca2+] = [SO42-] = 4.90 x 10-3 M
Since the equation above shows a 1:1 mole ratio of calcium sulfate to Ca2+ ions, we can assume that 4.90 x 10-3 moles of CaSO4 will dissolve.
Na2SO4 + Ca(NO3)2 = CaSO4 + 2NaNO3
n(Na2SO4) = C*V = 0.01mol/L*0.3L =0.003 mol
According to the equation 0.003 mol of Na2SO4 reacts with 0.003 mol of Ca(NO3)2, and this amount corresponds to that specified in Ksp .
n(Ca(NO3)2) = 0.003 mol
m(Ca(NO3)2) = n*M = 0.003mol*164g/mol = 0.492 g
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