Same chapter3 marksDifficulty: Medium
Why is ammonia dried over quicklime and not over concentrated sulphuric acid or phosphorus pentoxide?
Study of Compounds: Ammonia
3 marksDifficulty: Medium
Why is aqueous ammonia a weak base while sodium hydroxide is a strong base?
Original Khojo Papers practice question — not from a past board paper.
Answer
Ammonia reacts with water only to a small extent, so an aqueous solution contains a low concentration of hydroxide ions and a large proportion of undissociated ammonia molecules. Sodium hydroxide is ionic and dissociates almost completely in water, giving a high concentration of hydroxide ions.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
This is why ammonium hydroxide precipitates metal hydroxides but does not dissolve amphoteric ones such as lead hydroxide.
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