Explain a black precipitate remaining from the seperation

Reference no: EM13327786

A black precipitate remaining from the seperation of Cr^3+ and Fe^2+ ions is dissolved in HCl and HNO3. Some NH3 is added, followed by several drops of dimethylglyoxime. (a). A colorless solution results, What do you think happened. (b). What might have gone wrong

Reference no: EM13327786

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