Question

Q2.Kjeldahl's method is based on the principle that when the nitrogenous compound is beated with concentrated sulfuric acid in the presence of potassium sulphate and copper sulphate, the nitrogen present in the compound is converted to ammonium sulphate. Dekha the ammonium sulphate is formed is decomposed with excens nf alkali and ammonia evolved volumetrically

1. Name another method used to find out the percentage of nitrogen in the compound,

I write the formula used to find the percentage of nitrogen,

ii. What is the reaction involved in the Kjeldahl's method

71%

What is need of adding potassium sulphate ind copper sulphate in this method?​

Answer 1

Answer:

another method used to find out the persentage of nitrogen is Dumas method.

%N = 28*v *100/22,400*m .

in kjeldal method

organic compound + conc. H2so4 ------> (NH4 )2 + SO4 [in the presence of k2so4+ and Cuso4]

on further heating with NaOH NH3 (g) will formed

this is called digestion i.e. first step..