Based on a Ksp experiment, describe a way to soften water by removing calcium ions. What would be the advantages and disadvantages of your method?

Answer 1

This question is really for you to use your imagination and your knowledge of chemistry. I can give you a hint: Ca^2+ can be pptd by using H2SO4, for example, since CaSO4 is moderately insoluble. BUT, would you want to drink water that had been treated with an excess of H2SO4? I would rather drink the extra calcium ions, I think.