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  4. Dimethyl glyoxime gives a red precipitate with Ni 2+, which is used for its detection. To get this precipitate readily the best pH range is

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Q. Dimethyl glyoxime gives a red precipitate with $Ni ^{2+}$, which is used for its detection. To get this precipitate readily the best $pH$ range is

AIIMSAIIMS 2004Equilibrium

Solution:

Nickel ions $\left( Ni ^{2+}\right)$ can be best estimated qualitatively and quantitatively by the use of dimethylglyoxine (DMG) solution. The reaction occurs as follows :
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It may be evidently seen that in this reaction each DMG ion lose one proton.
Hence, a basic medium is needed to facilitate this reaction.
Thus this reaction is carried out in ammoniacal solution $( pH =9-11)$