MCAT General Chemistry Question 77: Answer and Explanation

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Question: 77

2. What is the equilibrium expression for the reaction Cu₂SO₄ (s) ? 2 Cu⁺ (aq) + SO₄^2- (aq)?

Correct Answer: D

Explanation:

Recall that pure solids and liquids do not appear in the equilibrium expression; thus, this K_eq has no denominator because the only reactant is a solid, cuprous sulfate. This could also be called K_sp because a solid is dissolving into ions in solution. The correct K_eq should have [Cu⁺] squared because its stoichiometric coefficient is 2.

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