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Hydrogen Chloride — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryHydrogen Chloride2 Marks
Question
Why are conventional drying agent such as calcium oxide and phosphorus pentoxide not used for drying moist HCl gas? Give equations.
✓

Answer

The drying agents react chemically with HCl and hence cannot be used as shown by the equations below :
CaO + 2HCl → CaCl2 + H2O
$2 P _2 O _5+3 HCl \longrightarrow \underset{\substack{\text { Phosphorus } \\ \text { oxy-chloride }}}{ POCl _3}+\underset{\substack{\text { meta phosphoric } \\ \text { acid }}}{3 HPO _3}$

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