A white solid dissolves in water to form a neutral solution. No precipitate form

Question

A white solid dissolves in water to form a neutral solution. No precipitate forms when this solution is treated with a solution of NH4Cl/NH3 buffer, nor when (NH4)2S is added. When the solution is acidified with HC2H3O2 and K2CrO4 is added, a yellow precipitate forms. This precipitate dissolves upon addition of concentrated HCl. Acidification of a solution of the solid with HNO3 followed by addition of AgNO3 causes formation of a white precipitate. What is the identity of the original solid? Thank you!

Explanation / Answer

Possibly PbCrO4

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