Problem: The Ksp of PbBr2 is 6.60 x 10-6What is the molar solubility(M) of PbBr2 in a 0.500M Pb(NO3)2 solution?

FREE Expert Solution

Since the compounds are ionic compounds, they form ions when dissociating in water. The dissociation of PbBr2 and Pb(NO3)2 in water are as follows:


The bromide ion, Br, has a charge of – 1. This means Pb has a charge of +2:

PbBr2(s)  Pb2+(aq)2 Br(aq)


The nitrate ion, NO3, has a charge of – 1. This means Pb has a charge of +2:

Pb(NO3)2(s)  Pb2+(aq)2 NO3(aq)


Notice that there is a common ion present, Pb2+. The common ion effect states that the solubility of a salt is lower in the presence of a common ion.


We can construct an ICE table for the dissociation of PbBr2. Remember that solids are ignored in the ICE table.

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The Ksp of PbBr2 is 6.60 x 10-6

What is the molar solubility(M) of PbBr2 in a 0.500M Pb(NO3)2 solution?

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