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What is the role of CuSO(4) and K(2)SO(4...

What is the role of `CuSO_(4) and K_(2)SO_(4)` used in Kjedahl's method for the estimation of nitroge?

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Potassium sulphate increases the boiling point of `H_(2)SO_(4)` and thus ensures complete reaction while copper sulphate catalyses the reaction.
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