Consider the reaction caso4 (s) ⇌ca2 + (aq) + so2-4 (aq) at 25 ∘c the equilibrium constant is kc=2.4*10-5 for this reaction. if excess caso4 (s) is mixed with water at 25 ∘c to produce a saturated solution of caso4, what is the equilibrium concentration of ca2+?

Question

Chemistry

Harrison Sweeney

22 June, 15:09

Consider the reaction caso4 (s) ⇌ca2 + (aq) + so2-4 (aq) at 25 ∘c the equilibrium constant is kc=2.4*10-5 for this reaction. if excess caso4 (s) is mixed with water at 25 ∘c to produce a saturated solution of caso4, what is the equilibrium concentration of ca2+?

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Elsa · Answer 1

According to the balanced equation of the reaction:

CaSO4 (s) ↔ Ca2 + (aq) + SO2-4 (aq)

So Kc = [Ca2+] [SO2] and we have [Ca2+] & [SO2] are the same so we can assume it both by X

So KC = X^2

X^2 = 2.4 x 10^-5

X = √2.4X10^-5 = 0.004899 = 4.9 X 10^-3 m