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why a paper ball {carbon} is added [in the analysis of nitrate cation ]to a boiling solution of salt {containing nitrate }and conc.H2SO4

why a paper ball {carbon} is added [in the analysis of nitrate cation ]to a boiling solution of salt {containing nitrate }and conc.H2SO4

Grade:12

1 Answers

Ramko
16 Points
4 years ago
Paper, being derived from living matter contains Carbon in it. Carbon reduces Nitrogen in Nitrate(+5 oxidation state) to Nitrogen Dioxide ( +4 O.S). Hence the characteristics brown fumes of Nitrogen dioxide are produced and it helps in Identification of NO3- ANION.

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