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प्रश्न
Answer the following.
How is hydrogen chloride prepared from sodium chloride?
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उत्तर
1) In the laboratory, hydrogen chloride is prepared by heating sodium chloride (common salt) with concentrated sulfuric acid
\[\ce{\underset{\text{Sodium chloride}}{NaCl} + \underset{\text{Sulfuric acid (conc.)}}{H2SO4} ->[420 K] \underset{\text{Sodium hydrogen sulfate}}{NaHSO4} + \underset{\text{Hydrogen chloride}}{HCl}}\]
\[\ce{\underset{\text{Sodium hydrogen sulfate}}{NaHSO4} + \underset{\text{Sodium chloride}}{NaCl} ->[823 K] \underset{\text{Sodium sulfate}}{Na2SO4} + \underset{\text{Hydrogen chloride}}{HCl}}\]
2) HCl gas can be dried by passing it through concentrated sulfuric acid.
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