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To avoid the precipitation of hydroxides...

To avoid the precipitation of hydroxides of `Ni^(2+),Co^(2+),Zn^(2+) and Mn^(2+)` along with those of `Fe^(3+),Al^(3+) and Cr^(3+)` the third group cations, solution should be:

A

Heated with a few drop of cone `HNO_(3)`

B

Treated with excess of `NH_(4)CI`

C

Conccotrated

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
b
The presence of `NH_(4)CI` in excess reducts degree of dissociation of `NH_(4)OH` to a considerable amount and thas `[OH^(Theta)]` just sufficient to cross ever the and ionic concentration product of hyddroxide of group III elements to their `K_(sp)`
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CENGAGE CHEMISTRY ENGLISH-QUALITATIVE INORGANIC SALT ANALYSIS-Exercises (Single Correct) Part-C (Analysis Of Cations)
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