Why is the ratio of 2:3 of ammonium chloride and calcium hydroxide taken in lab preparation of ammonia gas

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Solution

Ammonium chloride , like camphor is sublimable. This means, during reaction, the heat will cause Ammonium chloride to vapourise, and hence, ammonium chloride vapours are formed with ammonia gas.

To prevent this more Calcium hydroxide is used. Calcium hydroxide will absorb excess heat, and prevent sublimation . This prevents loss of ammonium chloride as vapour.

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Why is higher ratio of calcium hydroxide is taken (with ammonium chloride) in labrotary preparation of ammonia

Q. In the preparation of ammonia gas from ammonium chloride and calcium hydroxide, the reactants are ground thoroughly________

Q. Write the equation for:
(i) The preparation of ammonia from ammonium chloride and calcium hydroxide.
(ii) The reaction of hydrogen chloride with ammonia.

(a) Write the equation for:
(i) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(ii) the preparation of ammonia from ammonium chloride and calcium hydroxide.
(iii) the reaction of hydrogen chloride with ammonia.

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N H_{3}

from ammonium chloride and calcium hydroxide.

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