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Why is sodium sulfate after the sodium sulfite solution is evaporated?

Why is sodium sulfate after the sodium sulfite solution is evaporated?
Update Time:2018-11-16
 Sodium sulfite has a high melting point and will not decompose or hydrolyze when it is evaporated to dryness. If it can be hydrolyzed, it will react, and sulfur dioxide will be reabsorbed by sodium hydroxide, so it will not be hydrolyzed. Sodium sulfite is reductive and reacts with O2 to form sodium sulfate upon heating.
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