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When NaBr is heated with conc H2SO4 ,Br2 is produced but when NaCl is heated with conc H2SO4, HCl is produced. Why?

When NaBr is heated with conc H2SO4 ,Br2 is produced but when NaCl is heated with
conc H2SO4, HCl is produced. Why?

Grade:upto college level

2 Answers

Gaurav
askIITians Faculty 164 Points
9 years ago
Hello Student
NaCl is a volatile solid. Less volatile liquid H2SO4 displaces the more volatile sodium chloride and hence there is no changed in oxidation state. Due to this it becomes a simple displacement reaction as
NaCl + H2SO4 à NaHSO4 +HCl
In case of NaBr, Br- acts as reducing agent fr H2SO4 and the sulphuric acid is reduced to sulphr ioxide by bromide ion which itself gets oxideised to give bromine free molecule.
2NaBr + 2H2SO4 à NaHSO4 + Br2 + SO2 + 2H2OHello Student

Kushagra Madhukar
askIITians Faculty 628 Points
3 years ago
Dear student,
 
NaCl is a volatile solid. Less volatile liquid H2SO4 displaces the
more volatile sodium chloride and hence there is no changed in oxidation state. Due to this it becomes a simple displacement reaction as
NaCl + H2SO4 →  NaHSO4 +HCl
In case of NaBr, Br- acts as reducing agent fr H2SO4 and the sulphuric acid is reduced to sulphr ioxide by bromide ion which itself gets oxideised to give bromine free molecule.
2NaBr + 2H2SO4 →  NaHSO4 + Br2 + SO2 + 2H2O
 
Hope it helps.
Thanks and regards,
Kushagra

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