Discussion
Arrange the main steps of the Solvay process in order.
1. carbonate it to precipitate sodium bicarbonate
2. purify and saturate the brine
3. calcine the bicarbonate to soda ash
4. ammoniate the brine
Answer: D
Ammonia must be present before carbon dioxide is introduced, since it is what makes the solution absorb the gas. The calcination releases carbon dioxide which is returned to the carbonating tower. The order of the middle two steps cannot be reversed.
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