CBSE Class 11-science Answered
Why concentrated HNO3 is added to sodium extract before testing for halogen? Pls explain briefly in lucid language
Asked by ppratim02 | 12 Feb, 2016, 10:29: AM
Expert Answer
Conc. HNO3 is added to sodium extract before adding silver nitrate for testing halogens, to decompose any NaCN or Na2S if present.
If Conc. HNO3 is not added to sodium extract before adding silver nitrate for testing halogens, NaCN and Na2S will react with AgNO3 and interfere with the test for halogens.
When Nitric acid is not added: -
NaCN + AgNO3 → AgCN ↓+ NaNO3
Na2S + AgNO3 → Ag2S ↓+ 2NaNO3
When Nitric acid is added: -
NaCN + HNO3 → HCN ↑+ NaNO3
Na2S + HNO3 → H2S↑ + 2NaNO3
Answered by Vaibhav Chavan | 12 Feb, 2016, 03:40: PM
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