Question:
Give one relevant observation for the following:
(a) Sodium hydroxide is added dropwise to Calcium nitrate solution.
(b) Dilute Hydrochloric acid is added to Iron (II) sulphide.
(c) An amphoteric metal is added to hot concentrated alkali.
Give one relevant observation for the following:
(a) Sodium hydroxide is added dropwise to Calcium nitrate solution.
(b) Dilute Hydrochloric acid is added to Iron (II) sulphide.
(c) An amphoteric metal is added to hot concentrated alkali.
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To distinguish between Calcium and Magnesium salts using NaOH: Calcium forms a white precipitate that is sparingly soluble, whereas Magnesium forms a white precipitate that remains strictly insoluble in excess NaOH!
Updated On: Mar 12, 2026
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Solution and Explanation
(a) Observation: A white precipitate of Calcium hydroxide [Ca(OH)_2] is formed, which is sparingly soluble in excess of sodium hydroxide.
(b) Observation: A gas is evolved which has a characteristic foul smell of rotten eggs (Hydrogen Sulphide, H_2S).
(c) Observation: The metal dissolves with brisk effervescence as a colorless, odorless gas (Hydrogen) is evolved, which burns with a 'pop' sound.
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