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Explain about principle and reactions involved in carius method of estimation of sulphur. |
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Answer» Solution :Carius METHOD: (i) PRINCIPLE: A known mass of the organic substance is HEATED strongly with fuming `HNO_(3)`. C and H GET oxidized to `CO_(2)` and `H_(2)O` while sulphur is oxidised to sulphuric acid as follows. `Cunderset(ΗΝΟ_(3))OVERSET("Fuming")rarrCO_(2)` `2Hunderset(ΗΝΟ_(3))overset("Fuming")rarrH_(2)O` `SrarrSO_(2)overset(O+H_(2)O)rarrH_(2)SO_(4)` (ii) The resulting solution is treated with excess of `BaCl_(2)` solution, `H_(2)SO_(4)` present in the solution is converted into `BaSO_(4)` . From the mass of `BaSO_(4)`, the percentage of sulphur can be calculated. |
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