Why is K+ larger than Ca^2+?

What will be the concentration of Ca2+ when Ag2SO4 begins to precipitate?

A solution contains 0.0594 M Ca2+ and 0.0214 M Ag+. Can 99.00% of Ca2+ be precipitated by sulfate, without precipitating Ag+? (For CaSO4, Ksp = 2.4 10-5. For Ag2SO4, Ksp = 1.5 10-5.) What will be the concentration of Ca2+ when Ag2SO4 begins to precipitate?
Answer:

Answer on this link p 2. https://docs.google.com/viewer?a=v&q=cache:B598jzneqnwJ:archives.evergreen.edu/webpages/curricular/2002-2003/envana2002/2002-2003/handouts/Analytical%2520Chemistry%2520Fall/Homework%2520Solutions%2520Week%25206.doc+&hl=en&gl=us&pid=bl&srcid=ADGEEShw2L2UwkApBXefnAZUfsQ1g6_VRiBteOCR_Sr9ef5KRIdWqCu2w9GFsIbhYeMWM84pAA41F_6mwldcConKDYnBk0NE-VnEaLTgG4bt80QOa0NtKQ-Lt4RdcOSKlFNRc3L9iAv8&sig=AHIEtbTYHYTWzqPCRgJRQlNI4buP7lxJTQ

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