(a) Name an element which reacts with hydrogen to form a compound whic

1.	(a) Name an element which reacts with hydrogen to form a compound which is strongly acidic in water.(b) Explain why to dilute hydrochloric acid cannot be concentrated by boiling beyond 22.2%.
Answer» (a) Chlorine. The compound formed which is strongly acidic in water, is HCl. H₂ + Cl₂ → 2HCl (b) A dilute aqueous solution of hydrochloric acid gets gradually concentrated on distillation, till the concentration of the acid reaches 22.2% HCl by weight which boils at 110°C. When this concentration is reached, no further increase in concentration of the acid becomes possible by boiling. This is because vapors evolved before 110°C are vapors of water but at temperature above 110°C vapors consist mostly of molecules of HCl.

(a) Name an element which reacts with hydrogen to form a compound which is strongly acidic in water.(b) Explain why to dilute hydrochloric acid cannot be concentrated by boiling beyond 22.2%.

Answer»

(a) Chlorine.

The compound formed which is strongly acidic in water, is HCl.

H₂ + Cl₂ → 2HCl

(b) A dilute aqueous solution of hydrochloric acid gets gradually concentrated on distillation, till the concentration of the acid reaches 22.2% HCl by weight which boils at 110°C. When this concentration is reached, no further increase in concentration of the acid becomes possible by boiling. This is because vapors evolved before 110°C are vapors of water but at temperature above 110°C vapors consist mostly of molecules of HCl.

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