Whew, I do believe I get it now. Thank you so much. If there's a problem like this on my final today, you may well have just saved my college career :-)
This problem is driving me nuts. :-p
The polyprotic acid, H[SIZE="1"]2SO[SIZE="1"]4 has a complete disassociation at the first step and its pKa for the second step is 1.9. When CaSO[SIZE="1"]4 dissolves ina strong acidic solution of HCl, the final concentration of Ca2+ is 0.03 M and...