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KSP for Ba= 2.1x10^-10 KSP of AG 1.2x10^-12 We have two solutions. The fust one

ID: 954941 • Letter: K

Question

KSP for Ba= 2.1x10^-10

KSP of AG 1.2x10^-12

We have two solutions. The fust one contains 0.01 M Ba^2= and 0.01 M Ag+. The second solution contains 0.05 M Ba^2+ and 0.05 M Ag^+. For each solution we would like to separate the ions by precipitation with chromate (Cr0_4^2). The objective of such a separation is to have 99.99% of one ion precipitated as a chromate salt while the other ion is still entirely dissolved. a) which ion will precipitate fust? b) can you separate the ions by precipitation of 99.99% of one ion?

Explanation / Answer

a. The ion with small Ksp will precipitate first, so Ag+ will precipitate first.