Problem #2

An ion exchange resin prefers calcium over magnesium, indicated by Xcalcium = 0.6 and

Ymagnesium = 0.3. The same resin prefers magnesium over sodium, indicated by Xmagnesium

= 0.6, Ysodium=0.2, What is the separation factor for the resin for calcium over sodium?

A water contains sodium at 20 mg/L and calcium at 120 mg/L, assume all other cations are of

negligible concentration. Using the separation factor from above, calculate volume of resin

necessary to treat a water volume of 10,000 L to remove calcium given a resin capacity of 15

eq/L