CHEM 1212 EXPERIMENT 13 Final Exam Questions and Answers Graded A+ Updated.

Group 3 cations precipitate as _______ compounds from a _____ solution (pH ≥ 9). - Answer sulfide basic The seven cations of Group 3 are: - Answer Fe3+, Cr3+, Al3+, Co2+, Ni2+, Mn2+, and Zn2+ These Group 3 cations are all first-row transition metals - Answer Fe3+, Cr3+, Ni2+, Mn2+, and Zn2+. In general, transition metal compounds and solutions are ______________, and the _________ and solutions in this scheme have distinctive colors. - Answer colored solids Cr(OH)3 and Zn(OH)2 - Answer amphoteric insoluble, but dissolve when the solution is made either strongly acidic or basic - Answer amphoteric compounds Fe3+(yellow-gold, aq) + 3 OH-(aq) → - Answer Fe(OH)3(brown, s) Ni2+(green, aq) + 2 OH-(aq) → - Answer Ni(OH)2(green, s) Mn2+(very pale pink, aq) + 2 OH-(aq) → - Answer Mn(OH)2(pale pink, s) Zn2+(colorless, aq) + 4 OH-(aq)→ - Answer [Zn(OH)4]2-(colorless, aq) Cr3+(dark blue-violet, aq) + 4 OH-(aq) → - Answer [Cr(OH)4]- (blue-green, aq) portion of the whole - Answer aliquot