an unstable acid produced when sulphur dioxide dissolves in water: used as a preservative for food and a bleaching agent. Formula: H 2 SO 3Systematic name: sulphuric(IV) acid
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Examples from the Web for sulphurous acid
Though commingled with sulphurous-acid gas, it still had the characteristic smell of steam.Outlines of the Earth's History|Nathaniel Southgate Shaler