Na2CO3 is added to a sol'n containing .02M BaCl2 and .003M CaCl2.
a) Which cation will precipitate first, Ba2+ or Ca2+, as the concentration of Na2CO3 is increased?
b) Determine the concentration of CO3 2- at which precipitation begins. Given Ksp (BaCO3) = 2.6E-9 and Ksp (CaCO3) = 5.0E-9
I know that if the cations are of equal concentration, a) can be determined simply from comparing Ksp values, but I'm unsure how to do this problem with different concentrations...