During estimation of nitrogen by kjeldahl's method , copper sulphate is added to sulphuric acid. Why?
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During estimation of nitrogen by Kjeldahl's method, copper sulphate is added to sulphuric acid because:
- In the digestion process, copper sulphate acts as a catalyst in order to speed up the reaction and the efficiency of the procedure.
- Copper sulphate is preferred over titanium sulphate because it is more environment friendly while the latter is more toxic.
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Copper sulphate is added in Kjeldahl's process to increase the efficiency of the process.
Explanation:
- Kjeldahl's process is the process where we can quantitatively estimate the amount of different compounds present in an organic compound.
- In case of nitrogen estimation, a step utilizes the concentrated Sulphuric acid.
- Often with the concentrated Sulphuric acid, copper sulphate is added.
- This is done to increase the boiling points of sulphuric acid.
- This compound also increases the efficiency of sulphuric acid in digesting the compound.
- Often potassium sulphate is added in place of copper sulphate because the former is more environment friendly.
For more information about kjeldahl's method,
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In Kjeldahl’s method, CuSO₄ acts as
(a) oxidising agent
(b) reducing agent
(c) hydrolysing agent
(d) catalytic agent
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