Silver sulfite is the chemical compound with the formula Ag2SO3.

This unstable silver compound when heated and/or in light it decomposes to silver dithionate and silver sulfate.

[3] Silver sulfite can be prepared by dissolving silver nitrate with the stoichiometric quantity of sodium sulfite solution, yielding a precipitation of silver sulfite by the following reaction: After precipitation then filtering silver sulfite, washing it using well-boiled water, and drying it in vacuum.

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