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Kjeldahl method (1883), H2SO4 sulphuric acid, NaOH sodium hydroxide,…

- - - - absorbed in std sol° H2SO4
        
        how ? by estimating the qty of H2SO4 left after absorp° of ammonia
        
        titra° / to titrate (alkali sol°)
        
        = difference btw H2SO4 taken/left after reac°
        
        % N2 ?
- - - - K2SO4 potassium sulfate
        
        CuSO4 copper sulfate