Engineering
Chemistry
Ostwald Law and Degree of Dissociation
Acid Base Theories
Buffer Solution
Question
Which of the following pairs will show common ion effect ?
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Solution
Common ion effect is observed when a solution of weak electrolyte is mixed with a solution of strong electrolyte which provides an ion common to that provided by a weak electrolyte.
Ammonium hydroxide is a weak electrolyte and ammonium chloride is a strong electrolyte. Ammonium chloride provides ammonium ions common to ammonium hydroxide.
Thus, the pair NH4OH + NH4Cl shows common ion effect.
All other pairs have a mixture of strong electrolytes mixed with strong electrolyte hence they do not show common ion effect.