Analytical ChemistryHard
Question
Fe(OH)3 and Cr(OH)3 precipitates can be completely separated by :
Options
A.Aq. NH3
B.HCl
C.NaOH/H2O2
D.H2SO4
Solution
Both dissolves in acids. Cr(OH)3 is partially soluble while Fe(OH)3 is not soluble in aqueous NH3. Only Cr(OH)3 not Fe(OH)3 is soluble by NaOH/H2O2 according to the reaction.
Cr(OH)3 ↓ (green)
CrO42- (yellow solution) + H2O.
Cr(OH)3 ↓ (green)
CrO42- (yellow solution) + H2O.Create a free account to view solution
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