Analytical ChemistryHard
Question
Dimethyl gloxime gives a red preipitate with Ni2+, which is used for its detection. To get this precipitate reddily, the best pH range is :
Options
A.< 1
B.2 - 3
C.3 - 4
D.9 - 11
Solution
The reaction indicates that protons are released during reaction. Hence a basic medium is needed to facilitate the reaction. Thus the best pHrange is 9 - 11. If medium is kept acidic then nitrogen atom of the ligand will start donating lone pair to H+ ion of the acid and not to central metal ion.
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