Analytical ChemistryHard
Question
In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :
Options
A.decrease concentration of OH- ions
B.prevent interference by phosphate ions
C.increase concentration of Cl- ions
D.increase concentration of NH4+ ions
Solution
Group 3rd radicals are precipitated as hydroxides and the addition of NH4Cl suppresses the ionisation of NH4OH so that only the group 3 cations are precipitated as hydroxides because of their low solubility products.
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