CO32- + BaSO4 = BaCO3 + SO42-
K = [SO42-] / [CO32-] = Ksp(BaSO4) / Ksp(BaCO3)
[SO42-] = 0.1 mol
所以
[CO32-] = Ksp(BaCO3) * [SO42-] / Ksp(BaSO4) = 2.5×10^(-9) * 0.1 / 10^(-10) = 2.5 mol/L
即 Na2CO3浓度至少为 2.5 mol/L
CO32- + BaSO4 = BaCO3 + SO42-
K = [SO42-] / [CO32-] = Ksp(BaSO4) / Ksp(BaCO3)
[SO42-] = 0.1 mol
所以
[CO32-] = Ksp(BaCO3) * [SO42-] / Ksp(BaSO4) = 2.5×10^(-9) * 0.1 / 10^(-10) = 2.5 mol/L
即 Na2CO3浓度至少为 2.5 mol/L