Analytical ChemistryHard
Question
A metal salt solution gives a yellow precipitate with silver nitrate. The precipitate dissolves in dilute nitric acid as well as in dilute ammonia solution. The solution contains :
Options
A.bromide ions
B.iodide ions
C.phosphate ions
D.chromate ions
Solution
Ag3PO4 is yellow precipitate which is soluble both in dilute ammonia solution and dilute HNO3.
HPO42- + 3Ag+ → Ag3PO4↓ + H+
Ag3PO4 + 2H+ → H2PO4-↓ + 3Ag+ ; Ag3PO4↓ + 6NH3 → 3[Ag(NH3)2]+ + PO43-
Pale yellow precipitate of AgBr is not soluble in dilute HNO3; bright yellow precipitate of AgI is not soluble in both; Ag2CrO4 is obtained as red precipitate.
HPO42- + 3Ag+ → Ag3PO4↓ + H+
Ag3PO4 + 2H+ → H2PO4-↓ + 3Ag+ ; Ag3PO4↓ + 6NH3 → 3[Ag(NH3)2]+ + PO43-
Pale yellow precipitate of AgBr is not soluble in dilute HNO3; bright yellow precipitate of AgI is not soluble in both; Ag2CrO4 is obtained as red precipitate.
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