To avoid the precipitation of hydroxides of Ni2+, Co2+, Zn2+ and Mn2+ along with those of Fe3+, Al3+ — Qualitative and Quantitative Analysis Chemistry Question
Question
To avoid the precipitation of hydroxides of Ni2+, Co2+, Zn2+ and Mn2+ along with those of Fe3+, Al3+ and Cr3+ the third group solution should be:
Answer: B
💡 Solution & Explanation
The value of Ksp of hydroxides of Fe3+, Cr3+, Al3+ are lower than that of Co2+, Ni2+, Mn2+ and Zn2+. Therefore; in the presence of NH4Cl, dissociation of NH4OH is suppressed and conc. of OH-, furnished from NH4OH, is such that only third group basic radicals are precipitate.
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