For testing halogens in an organic compound with AgNO_{3} solution, sodium extract (Lassaigne’s test) is acidified with dilute HNO_{3}. What will happen if a student acidifies the extract with dilute H_{2}SO_{4} in place of dilute HNO_{3} ?

Answers (1)

Elements like nitrogen, halogens, sulphur and phosphorous present in organic compounds converted into ions by fusing with sodium metal which is then plucked in distilled water getting sodium extract. On adding diluted H_{2}SO_{4} in place of diluted HNO3 for testing halogens by AgNO_{3}, a white precipitate of Ag_2SO_{4} is formed. This will lead to the wrong result of chloride. Hence, only HNO_{3} is used instead of diluted H_{2}SO_{4}.

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