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What happens to acid when heated

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Answer:

What happens to acid when heated? When heated, the pure 100% acid loses sulfur trioxide gas, SO3, until a constant-boiling solution, or azeotrope, containing about 98.5% H2SO4 is formed at 337°C. Hot concentrated sulfuric acid reacts with most metals and with several nonmetals, e.g., sulfur and carbon.

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