Concentrated sulphuric acid contains 2% water. It is a very strong oxidising agent and is often used to rid a system of water (it is very hygroscopic). Sulphuric acid is a strong acid. More negative metals than hydrogen dissolve in it, .... This type of azeotropic mixture should have the same boiling point if it is mixed in the same relative mixture in both mixed fractions. For this reason, the mixture cannot be separated by distillation. In the presence of light, ...
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