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Obtaining a concentrated aqueous solution of potassium sulfite

To obtain a concentrated aqueous solution of potassium sulfite, you will need:
- potassium metabisulfite (it is best to buy it in wine shops)
- potassium hydroxide (caustic potassium)
K2S2O5 + 2KOH → 2K2SO3 + H2O

In water, metabisulfite is...
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