what happens when H2SO3 is heated in 150°C
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When heated, the pure 100% acid loses sulfur trioxide gas, SO 3, until a constant-boiling solution, or azeotrope, containing about 98.5% H 2SO 4 is formed at 337°C. ... When hot it is an oxidizing agent, the sulfur in it being reduced; sulfur dioxide gas may be released.
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