Analytical ChemistryHard
Question
The reagents, NH4Cl and aqueous NH3 will precipitate :
Options
A.Ca2+
B.Al3+
C.Mg2+
D.Zn2+
Solution
The KSP of Al(OH)3 is low as compared to that of the hydroxides of other metals. The OH- concentration provided by ammonium hydroxide in presence of NH4Cl is just sufficient to precipitate Al3+ as Al(OH)3.
Al3+ + NH3 + H2O
Al(OH)3 ↓ (gelatinous white) + NH4+.
Al3+ + NH3 + H2O
Al(OH)3 ↓ (gelatinous white) + NH4+. Create a free account to view solution
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