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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...

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 the resulting solution has a volume of 1.1 L , what is the minimum mass of CaSO4(s) needed to achieve equilibrium? Express your answer to two significant figures and include the appropriate units.

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Answer #1

The solids are not part of the equilibrium constant, since its concentration is an intensive property and not dependent on the amount of substance. Equilibrium constant for the reaction is:

Concentration of CaSO4 is constant

concentration of Ca+2 y SO4-2 are equal

     

Therefore

for there is such concentration of ions, as the ratio is equimolar must be equal amount of CaSO4

Mass of CaSO4 (MW 136,14g/mol)

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For a solution of 1,1L :

Minimum mass of CaSO4(s) needed to achieve equilibrium is 0,74g for a solution of 1,1L.

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