A25. What is the molar solubility of cobalt carbonate, CoCO3, in an aqueous solution containing 0.3 M sodium carbonate at 25 °C? (Cobalt carbonate Ksp = 1.0 × 10–10)
(A) 1.0 × 10–5 M
(B) 5.48 × 10–6 M
(C) 0.3 M
(D) 3.3 × 10–10 M
(E) 1.0 × 10–10 M
Na2CO3 here is Strong electrolyte
It will dissociate completely to give [CO32-] = 0.3 M
At equilibrium:
CoCO3 <----> Co2+ + CO32-
s 0.3 + s
Ksp = [Co2+][CO32-]
1*10^-10=(s)*(0.3+ s)
Since Ksp is small, s can be ignored as compared to 0.3
Above expression thus becomes:
1*10^-10=(s)*(0.3)
1*10^-10= (s) * 0.3
s = 3.333*10^-10 M
Answer: 3.3*10^-10 M
A25. What is the molar solubility of cobalt carbonate, CoCO3, in an aqueous solution containing 0.3...
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