Why do interfering radicals interfere in detection of Basic radicals from group il.
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Interfering radicals are oxalate, tartrate, fluoride, borate and phosphate and they are anionic radicals. They form complex with III group reagent ammonium chloride and ammonium hydroxide.This leads to incomplete precipitation of III group cations and causes immature precipitation of IV and V group cations in alkaline medium
For 1 group and 2 group analysis, medium remains acidic (dilute HCl) that’s why they do not interfere then. But for 3 group analysis the medium becomes alkaline by group reagents ammonium chloride and ammonium sulphide. Here interfering radicals come into action and disturb the solubility product of cations which causes their premature or incomplete precipitation.
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