Same chapter3 marksDifficulty: Medium
What is a buffer solution? Give one example of an acidic and one of a basic buffer.
Equilibrium
3 marksDifficulty: Medium
What is the common ion effect? Give one application of it.
Original Khojo Papers practice question — not from a past board paper.
Answer
The common ion effect is the suppression of the ionisation of a weak electrolyte by adding a strong electrolyte that has an ion in common with it. It is used in qualitative analysis, where ammonium chloride is added before ammonium hydroxide so that the concentration of hydroxide ions stays low enough to precipitate only the group III hydroxides.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
It follows directly from Le Chatelier's principle.
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