Purification of table salt (NaCl) by passing HCl gas through its saturated aqueous solution is an example of:
Correct answer: C. Common ion effect
- A. Law of mass action
- B. Hess's law
- C. Common ion effect
- D. Henry's law
Explanation
Adding HCl introduces extra Cl⁻ ions into the saturated NaCl solution. This suppresses the dissociation of NaCl, reducing its solubility. This phenomenon is called the common ion effect.
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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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