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
View Solution FreeMore Analytical Chemistry Questions
The presence of magnesium is confirmed in the qualitative analysis by :...Which of the following reagents can be used for making the distinction between AgCl and AgI ?...When HNO3 is added to sodium ferrocyanide, which of the following observation is observed ?...A mixture when rubbed with dilute acid smells like vinegar. It contains :...Borax bead test is given by :...