In the equilibrium expression for the reaction BaSO4(s) ⇌ Ba+2(aq) + SO4-2(aq) Ksp is equal to
Correct answer: A. [Ba2+][SO4-2]
- A. [Ba2+][SO4-2]
- B. [Ba2+][SO4 2−] / BaSO4
- C. [Ba2+][SO4 2−] / [BaSO4]
- D. [BaSO4] / [Ba2+][SO4 2−]
Explanation
The equilibrium expression for the dissolution of a sparingly soluble salt like BaSO4 involves only the concentrations of the ions in solution. Since BaSO4 is a solid, it does not appear in the expression. Therefore, the solubility product constant, Ksp, is given by [Ba2+][SO4 2−]. Options B and C incorrectly include the solid in the expression, and D inverts the relationship.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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