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# Sodium Sulfate vs Sodium Sulfite

I recently took a test and one of the questions was:

Which procedures will allow a student to differentiate between solid sodium sulfate and solid sodium sulfite?

I. Make solutions of each and look for a precipitate when added to $$0.10$$ M barium nitrate.

II. Add crystal of each to $$0.10$$ M HCl and watch for bubbles.

III. Make solutions of each and test with a pH indicator.