Consider the reaction CaSO4 (s) <---> Ca^2+ (aq) + SO4^2- (aq) At 25°C the equil

Question

Consider the reaction
CaSO4 (s) <---> Ca^2+ (aq) + SO4^2- (aq)
At 25°C the equilibrium constant Kc=2.5x10^-5 for this reaction.
(a) If excess CaSO4 (s) is mixed with water at 25°C to produce a saturated solution of CaSO4,what are the equilibrium concentrations of Ca^2+ and SO4^2-?

(b) If the resulting solution has a volume of 2.4 L, what is the minimum mass CaSO4 (s) needed to achieve equilibrium?

14) Consider the reaction caso.isJ Canaal + S0/(aaj At 2S·Cthe equilbrum cart stant is K.: 24 x 10" dar this reaction. (a) If excess CasOuls) is mixed with water at 25 "C to preduce a saturated solution of CasD, what are the eqalibrium concentrations of Ca and SOd b) If the resulting solution has a voluame of 2.4 L what is the minimum mass of Ca504sl neaded to achieve equilibnium?

Explanation / Answer

Please you must check Kc and Ksp values for CaSO4; because Ksp value for CaSO4 is 2.16x10-4

a) Kc = [Ca2+][SO42-]

[Ca2+] = [SO42-] = x

Kc = x2

x = (Kc)1/2

x = (2.5x10-5)1/2

x = 5x10-3

[Ca2+] = [SO42-] = 5x10-3 M

b) Ksp = [Ca2+][SO42-] = 2.16x10-4

[Ca2+] = [SO42-] = x

Ksp = x2

x = (Ksp)1/2

x = (2.16x10-4)1/2

x = 0.0147M

[Ca2+] = [SO42-] = [CaSO4] = 0.0147M

0.0147 mol/L x 2.4L = 0.03528 mol CaSO4

136 g/mol x 0.03528 mol = 4.79808 g CaSO4

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