Manufacture of urea
Urine contains some amount of urea so when it reacts with HNO
3
, a ppt of urea nitrate is formed which on reaction with BaCO
3
gives urea. In this process coloured impurities are removed by acidic KMnO
4
.
Properties
Breaking of urea takes place by NaOBr but Urea on Hoffmann’s Hypobromite reaction forms N
2
, CO
2
, H
2
O and NaBr while other amides furnish amines with lower homologue. Quantitative estimation of urea done by cleavage in the presence of urease or fission by HNO
2
.
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