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Analytical Chemistry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAnalytical Chemistry2 Marks
Question
Distinguish between the following pair of compound using the test given within bracket.
A lead salt and a zinc salt (using excess ammonium hydroxide
✓

Answer

$Pb\left(NO_3\right)_2+2 NH_4 OH \rightarrow Pb(OH)_2+2 NH_4 NO_3$
On adding excess of $NH _4 OH$, chalky white ppt. of insoluble $Pb ( OH )_2$ is formed.
$ZnSO_4+2 NH_4 OH \rightarrow Zn(OH)_2+\left(NH_4\right)_2 SO_4$
With excess of $NH _4 OH$, white gelatinous ppt. of soluble $Zn ( OH )_2$ is formed.

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