Ion group 2 sulfides can be separated from those from ion group 3 because PLEASE

Question

Ion group 2 sulfides can be separated from those from ion group 3 because

PLEASE EXPLAIN WHY!

a) ion group 2 sulfides are soluble in a phosphate buffer while ion group 3 sulfides are not

b) ion group 2 sulfides are insoluble in base while ion group 3 sulfides are insoluble in acid.

c) on group 3 sulfides are soluble in a phosphate buffer while ion group 3 sulfides are not.

d) None of these explanations is valid.

e) ion group 3 sulfides are insoluble in base while ion group 2 sulfides are insoluble in acid.

Explanation / Answer

b) ion group 2 sulfides are insoluble in base while ion group 3 sulfides are insoluble in acid.

Literary info:
Analytical Group III contains the metallic ions, Ni2+, Co2+, Mn2+, Fe3+, Al3+, Cr3+, and Zn2+. This experiment will not analyze Cr3+ or Co2+. These ions are not precipitated by hydrochloric acid (the Group I precipitant), nor are they precipitated by sulfide ions in solutions which are 0.3 M in hydrogen ion (the Group II precipitant). However, an ammonium sulfide solution precipitates Ni2+, Mn2+, Fe2+, and Zn2+ as sulfides and Al3+ as the hydroxide

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