Why the the temperature of the preparation of HCl gas kept below two hundred degree Celsius?
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Answer:
Sodium bisulphate reacts with common salt to form sodium
sulphate. The sodium sulphate so formed fuses in glass
apparatus and renders it useless.
NaHSO4 + NaCl Diffused ⎯⎯⎯→ light Na2SO4 + HCl
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