Choose the correct equilibrium expression for the precipitation of gypsum, CaSO₄·H₂O.

Question 3 options:

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Keq = (Ca²+)(SO₂²) Keq = (CaSO4) (H₂O)/(Ca²+)(SO4²-) Keq = (Ca²+)²(SO₂²-)² Keq = 1/(Ca²+)(SO₂2²-) Keq = (Ca²+)(SO4²)(H₂O)/(CaSO4 H₂O) Keq = (Ca²+)(SO42)(H₂O) Keq = (Ca²+)(SO₂²) Keq = (CaSO4) (H₂O)/(Ca²+)(SO4²-) Keq = (Ca²+)²(SO₂²-)² Keq = 1/(Ca²+)(SO₂2²-) Keq = (Ca²+)(SO4²)(H₂O)/(CaSO4 H₂O) Keq = (Ca²+)(SO42)(H₂O)

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