First slide

Practical organic analysis

Question

Why conc. nitric acid is added to Lassaigne’s filtrate before detecting halogens?

Moderate

A

$as to decompose {Na}_{2} S and NaCN$
B

$as to decompose NaCN and {Na}_{2} O$
C

$as to decompose NaCl and NaBr$
D

$as to decompose NaBr and NaI$

Solution

Before detecting halogens; conc. HNO₃ is added to Lassaigne’s filtrate to decompose NaOH and Na₂S.
$\begin{array}{l} {HNO}_{3} + NaCN \to {NaNO}_{3} + HCN \\ 2 {HNO}_{3} + {Na}_{2} S \to 2 {NaNO}_{3} + H_{2} S \end{array}$

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