For testing halogens in an organic compound with AgNO_3 solution,… - Vidyadip

Question

For testing halogens in an organic compound with $\mathrm{AgNO}_3$ solution, sodium extract (Lassaigne's test) is acidified with dilute $\mathrm{HNO}_3$. What will happen if a student acidifies the extract with dilute $\mathrm{H}_2 \mathrm{SO}_4$ in place of dilute $\mathrm{HNO}_3$ ?

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Answer

On adding dilute $\mathrm{H}_2 \mathrm{SO}_4$ for testing halogens in an organic compound with $\mathrm{AgNO}_3$, white precipitate of $\mathrm{Ag}_2 \mathrm{SO}_4$ is formed. This will interfere with the test of chlorine and this $\mathrm{Ag}_2 \mathrm{SO}_4$ may be mistaken for white precipitate of chlorine as AgCl . Hence, dilute $\mathrm{HNO}_3$ should be used instead of dilute $\mathrm{H}_2 \mathrm{SO}_4$.

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