Analytical ChemistryHard

Question

Which of the following reagents turns white precipitate of AgCl yellow ?

Options

A.NaI

B.Na₃AsO₃

C.Na₃AsO₄

D.NaCN

Solution

3AgCl + Na₃AsO₃ → Ag₃AsO₃↓ (yellow) + 3Cl^- + 3Na⁺.
AsO₄^3- + 3Ag⁺ → Ag₃AsO₄ ↓ (brownish-red).

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