Which is 80 times more soluble than the value we calculated neglecting hydrolysis!
Even though we derived Eq. 11 for calcium carbonate, the equation applies to all 1:1 salts of a
weak acid. (For polyprotic acids we have also assumed that only two species are important at the
given pH; for example for CaCO3 we only considered CO3
2- and HCO3
-
and neglected any
H2CO3.) So another example is the solubility of FeS