Problem: A solution contains 2.0 X 10 -3 M Ce3+ and 1.0 X 10 -2 M IO3 3-. Will Ce(IO3)3(s) precipitate? [Ksp for Ce(IO3)3 is 3.2 X 10-10.]

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FREE Expert Solution

• Q > Ksp: the solution is supersaturated and a precipitate will form. Reactants are favored.

• Q = Ksp: the solution is at equilibrium and no precipitate will form.

• Q < Ksp: the solution is unsaturated and no precipitate will form. Products are favored.


For Ce(IO3)3(s):

The sulfate ion, IO3, has a charge of –1. Ce then has a charge of +3. 

The dissociation of Ce(IO3)3(s) in water is as follows:


Ce(IO3)3(s)  Ce3+(aq) + 3 IO3(aq)


Calculate the reaction quotient for Ce(IO3)3 is:


Q=productsreactantsQ=[Ce3+][IO3-]3


Note that each concentration is raised by the stoichiometric coefficient: [Ce3+] is raised to 1 and [IO3] is raised to 3.


Solving for Q:

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Problem Details

A solution contains 2.0 X 10 -3 M Ce3+ and 1.0 X 10 -2 M IO3 3-. Will Ce(IO3)3(s) precipitate? [Ksp for Ce(IO3)3 is 3.2 X 10-10.]