We're being asked to calculate the mass of CoCO3 that would have been lost. Both NiCO3 and CoCO3 dissolve in the same solution.
The sulfate ion, CO32–, has a charge of –2. So the charge of Cobalt is +2:
NiCO3(s) ⇌ Co2+(aq) + CO32–(aq)
The sulfate ion, SO42–, has a charge of –2. So the charge of Nickel is +2:
CoCO3(s) ⇌ Co2+(aq) + CO32–(aq)
Notice that there is a common ion present, CO32–. 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 CoCO3. Remember that solids are ignored in the ICE table.
***From Part A of this problem, we also calculated that the concentration of CO32– at equilibrium is 3.6878×10–4 M.
Perform these calculations for nickel(II) carbonate.
(b) If the NiCO3 were a contaminant in a sample of CoCO3 (Ksp = 1.0 × 10–12), what mass of CoCO3 would have been lost? Keep in mind that both NiCO3 and CoCO3 dissolve in the same solution.
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