Question

Which among the following sets of compounds is used as raw material for the preparation of sodium carbonate by Solvay process?
A. `NaOH,HCl,CO_(2)`
B. `NH_(4)Cl,H_(2)O,NaCl`
C. `NaCl,NH_(3),Ca(OH)_(2)`
D. `NaCL,CaCO_(3),H_(2)SO_(4)`

Answer 1

Correct Answer - C
For the preparation of sodium carbonate by Solvay process, raw materials used are NaCl,`NH_(3)` and `Ca(OH)_(2)` (for `CO_(2)`).
The process involves the following reactions.
`NH_(3)+H_(2)O+CO_(2)toNH_(4)NO_(3)`
`CaCO_(3)overset(Delta)toCaO+CO_(2)`
`NaCl+NH_(4)HCO_(3)toNaHCO_(3)+NH_(4)Cl`
`CaO+H_(2)OtoCa(OH)_(2)`
`2NH_(4)Cl+Ca(OH)_(2)toCaCl_(2)+2NH_(3)+2H_(2)O`
`2NaHCO_(3)overset(Delta)toNa_(2)CO_(3)+H_(2)O+CO_(2)`
Most of the `NH_(3)` can be recovered in the process.