Analytical ChemistryHard
Question
A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dilute sulphuric acid, but gives no precipitate with sodium chloride or iodide, it is :
Options
A.lead carbonate
B.basic lead carbonate
C.barium carbonate
D.strontium carbonate
Solution
Ba2+ + CrO42- → BaCrO4↓ (yelllow) ; Ba2+ + SO4 → BaSO4 (white).
Ba2+ + 2Cl- → BaCl2 (soluble in water).
Ksp of SrCrO4 is high in acetic acid, so no precipitate is formed.
Lead carbonate and basic lead carbonate both gives precipitate with K2CrO4 and NaCl.
Ba2+ + 2Cl- → BaCl2 (soluble in water).
Ksp of SrCrO4 is high in acetic acid, so no precipitate is formed.
Lead carbonate and basic lead carbonate both gives precipitate with K2CrO4 and NaCl.
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