Analytical ChemistryHard
Question
Which of the following reagents gives a yellow precipitate with a hot faintly acidic solution of Bi3+ ions ?
Options
A.Ammonia solution (excess).
B.Freshly prepared 10% solution of pyrogallol.
C.Potassium iodide solution.
D.Freshly prepared 0.125 M alkaline sodium tetrahydroxidostannate (II) solution.
Solution
(A) Bi3+ + 3NH4OH → Bi(OH)3↓ (white) + 3NH4+
(B) Bi3+ + C6H3(OH)3 → Bi(C6H3O3)↓ (yellow) + 3H+
(C) Bi3+ + 3I- → BiI3↓ (black) ; BiI3 + I- → [BiI4]- (orange solution)
(D) Bi3+ + 3OH- → Bi(OH)3↓ (white) ; 2Bi(OH)3↓ + 3[Sn(OH)4]2- → 2Bi↓ (black) + 3[Sn(OH)6]2-
(B) Bi3+ + C6H3(OH)3 → Bi(C6H3O3)↓ (yellow) + 3H+
(C) Bi3+ + 3I- → BiI3↓ (black) ; BiI3 + I- → [BiI4]- (orange solution)
(D) Bi3+ + 3OH- → Bi(OH)3↓ (white) ; 2Bi(OH)3↓ + 3[Sn(OH)4]2- → 2Bi↓ (black) + 3[Sn(OH)6]2-
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