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Why concentrated nitric acid is used for halogen detection?

Why concentrated nitric acid is used for halogen detection?

Grade:11

1 Answers

Umakant biswal
5359 Points
4 years ago
dear anushka
If organic compound contains Nitrogen ,sulphur and halogens the nitrogen and sulphur create the problem in the identification of halogens. both will form NaCN and Na
2S on fusion with sodium metal. and both these compounds reacts with silver nitrate to give precipitate. These precipitates interfere with the precipitates of halogens. to avoid this nitric acid is added to the sodium extract. this nitric acid destroy  NaCN and Na2S compounds to form volatile gases. 
HOPE IT CLEARS 
REGARDS 

 

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