The raw materials used in solvay's process are:
NaCl, NH3, and CaCO3
The following reaction is solvay's process took place:
2NH3+CO2+H2O→(NH4)2CO3(NH4)2CO3+CaCl2→CaCO3↓+2NH4ClNH3+CO2+H2O→NH4HCO3NH4HCO3+NaCl30∘C⟶NaHCO3+NH4Cl
Calcination to get sodium carbonate
2NaHCO3→Na2CO3+H2O+CO2