The presence of common ions --------- the solubility of a slightly soluble ionic compound
Correct answer: A. Decreases
- A. Decreases
- B. Increases
- C. Neither decrease nor increase
- D. None
Explanation
The presence of a common ion decreases the solubility of a slightly soluble ionic compound. This phenomenon is known as the common ion effect.Here's how it works:Slightly soluble ionic compounds dissociate partially in water, forming ions in solution.When we add another soluble ionic compound that shares a common ion with the slightly soluble compound, the equilibrium between the solid and dissolved state shifts towards the solid phase.This happens because the addition of the common ion increases the concentration of that specific ion in the solution. According to Le Chatelier's principle, the equilibrium tries to counteract this change by reducing the amount of dissolved ions, hence decreasing the solubility of the slightly soluble compound
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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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