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How sulphur is estimated by Carius metho...

How sulphur is estimated by Carius method and give calculation.

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A known mass of an organic compound is heateed in a carius tube with sodium peroxide of fuming `HNO_(3)`. Sulphur present in the compound is Oxidized to sulphuric acid. It is precipitated as Barium sulphate by adding barium chloride solution. The precipitate is filtered dried and weighted the mass of `BaSO_(4)` is noted.
Mass of Organic compound taken `=mg`
mass of `BaSO_(4)`
1 mol of `BaSO_(4)=233g`
233g of `BaSO_(4)` contain 32 g of sulphur
`M_(1)g` of `BaSO_(4)` contain `(32xxM)/233` of sulphur.
% age of sulphur `=(32xxM_(1)xx100)/(233xxM)`
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