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Question
The equation given below relates the manufacture of sodium carbonate (molecular weight of Na2CO3 = 106).
- NaCl+NH3+ CO2+ H2O→ NaHCO3+NH4Cl
- 2NaHCO3→ Na2CO3+H2O + CO2
Equations (1) and (2) are based on the production of 21.2 g of sodium carbonate.
(a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate?
(b) To produce the mass of sodium hydrogen carbonate calculate in (a), what volume of carbon dioxide, measured at S.T.P. would be required?
Solution
(a) NaCl+NH3+ CO2 + H2O → NaHCO3+NH4Cl
2NaHCO3 → Na2CO3+H2O + CO2
From equation:
106 g of Na2CO3 is produced by = 168 g of NaHCO3
So, 21.2 g of Na2CO3 will be produced by = 168 × 21.2/106
= 33.6 g of NaHCO3
(b) For 84 g of NaHCO3, required volume of CO2 = 22.4 litre
So, for 33.6 g of NaHCO3, required volume of CO2 = 22.4 x 33.6/84
= 8.96 litre
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