Question

how is percentage of nitrogen in an organic compound estimated by kjeldahls method?​

Answer 1

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$\boxed{\sf\pink{Kjeldahl's\:method}}$

✔ In this method, the compound

heated with concentrated sulphuric acid in the presence of small amount of ${CuSo_4}$to convert nitrogen into Ammonium Sulphate

✔The contents of the flask are transferred to another flask and heated with excess of sodium hydroxide solution to liberate ammonia gas

✔ Ammonia gas so liberated is passed and absorbed known as the volume concentrated sulphuric acid

✔Organic compound +${H_2SO_4{\rightarrow}(NH_4)_2SO_4}$

${(NH_4)_2SO4+2NaOH{\rightarrow}Na_2SO_4+2H_2O+72NH_3}$

✔${2NH_3+H_2SO_4{\rightarrow}(NH_4)_2SO_4}$