Same chapter3 marksDifficulty: Medium
Why do the alkali metals impart a characteristic colour to a flame?
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3 marksDifficulty: Medium
Describe the Solvay process for the manufacture of sodium carbonate in outline.
Original Khojo Papers practice question — not from a past board paper.
Answer
Ammonia and carbon dioxide are passed into a saturated brine solution, so that sparingly soluble sodium hydrogen carbonate is precipitated and filtered off. Heating it gives sodium carbonate, water and carbon dioxide, which is recycled. The ammonia is recovered from the filtrate by treating it with the calcium hydroxide obtained from the same limestone.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The process is economical because both the ammonia and the carbon dioxide are recovered and reused.
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