To successfully separate and confirm Group V cations () from their dissolved carbonate mixture in acetic acid, which specific sequence of precipitating reagents must be followed to avoid false positiv

Question

To successfully separate and confirm Group V cations ($Ba^{2+}, Sr^{2+}, Ca^{2+}$) from their dissolved carbonate mixture in acetic acid, which specific sequence of precipitating reagents must be followed to avoid false positives?

Prashant Kotian · Accepted Answer

Correct answer: A. Barium must be removed first with Chromate (yellow ppt) because Barium also precipitates with Sulphate and Oxalate. Once Barium is filtered, Strontium is removed with Sulphate (white ppt) because it precipitates with Oxalate. Finally, Calcium is confirmed with Oxalate.

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