Question:
I want to know the preperation of washing soda. Is it prepared by electrolysis and what are the problems faced during its formation
Answer:
Carbon dioxide reacts with the dissolved ammonia to form ammonium carbonate followed by ammonium hydrogen carbonate.
2NH3 +H2O + CO2 à(NH4)2CO3
(NH4)2CO3 + H2O + CO2 à NH4HCO3
NH4HCO3 +NaCl àNH4Cl + NaHCO3
Sodium hydrogen carbonate crystal separates. These are heated to give sodium carbonate.
2 NaHCO3 àNa2CO3 + CO2 + H2O
But this process cannot be used to prepare potassium due to the high solubility of potassium bicarbonate and hence difficult to be precipitated by adding ammonium bicarbonate to a saturated solution of potassium
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