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Chemical Principles in the Laboratory

Slowinski, Wayne C. Wolsey, William L. Masterton

Chapter 38

Qualitative Analysis of Group III Cations - all with Video Answers

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Chapter Questions

01:33

Problem 1

Prepare a flow diagram for the separation and identification of the ions in Group III and put it on your Observations and Report sheet.

Nicole Smina
Nicole Smina
Numerade Educator
05:04

Problem 2

Write balanced net ionic equations for the following reactions:
a. Dissolving of $\mathrm{Ni}(\mathrm{OH})_{2}$ in nitric acid.
b. Oxidation of $\mathrm{Cr}^{3+}$ to $\mathrm{CrO}_{4}^{2-}$ by $\mathrm{OCl}^{-}$ in alkaline solution (OCl- is converted to $\mathrm{Cl}^{-}$ ).
c. The reaction of $\mathrm{Ni}^{2+}$ that separates it from $\mathrm{Fe}^{3+}$.
d. The confirmatory test for $\mathrm{Fe}^{3+}$

Vishal Sharma
Vishal Sharma
Numerade Educator
05:24

Problem 3

A solution may contain any of the Group III cations. Treatment of the solution with OCI- in alkaline medium yiclds a ycllow solution and a colored precipitate. The acidificd solution is unaffected by treatment with $\mathrm{NH}_{3}$. The colored precipitate dissolves in nitric acid; addition of excess $\mathrm{NH}_{3}$ to this acid solution produces only a blue solution. On the basis of this information, which Group III cations are present, abscnt, or still in doubt?
Present __________
Absent __________
In doubt __________

Kevin Chimex
Kevin Chimex
Numerade Educator