|MadSci Network: Chemistry|
Dear Talha Ali In adition to Ni, this reagant is most commonly used for the quantitative analysis for Palladium. It has also been used [but not very often] for Fe, Cu, Co, and Bi. For Ni, the solution must be only very faintly acidic [pH > 5] neutral, or slightly ammoniacal. The water-insoluble precipitate is intense red in color. Add a little ammoniun citrate or tartrate to prevent interference by hydrolysis and precipitation of Fe,Al, etc. if present Ferrous iron [FeII] forms a pink, SOLUBLE compound under these above conditions, which can be confused with the INSOLUBLE Ni compound. To avoid this interference, oxidize the Iron to FerrIC before adding the reagent For Pd, the solution must be cool, and acidic, 0.2 - 1.5 N HCl [2 - 5 % V/V in HCl]. A bright yellow precipitate is formed. This is nearly a specific reagent for Pd under these conditions. Bismuth with this reagent in hot strongly ammoniacal solution forms an intense bright yellow precipitate - a very sensitive test for Bi. Let me know if you need more information on this. Regards Charlie A. Crutchfield
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