Chapter 38, Qualitative Analysis of Group III Cations Video Solutions, Chemical Principles in the Laboratory

Problem 1

Prepare a complete flow diagram for the separation and identification of the ions in Group III and put it on the report page for this experiment.

Nicole Smina

Numerade Educator

05:09

Write balanced net ionic equations for the following reactions:
a. The oxidation of $\mathrm{Cr}^{3+}$ to $\mathrm{CrO}_{4}^{2-}$ by $\mathrm{ClO}^{-}$ in alkaline solution $\left(\mathrm{ClO}^{-} \text {is converted to } \mathrm{Cl}^{-}\right)$
b. The dissolution of $\mathrm{Ni}(\mathrm{OH})_{2}$ in nitric acid
c. The confirmatory test for $\mathrm{Ni}^{2+}$
d. The confirmatory test for $\mathrm{Fe}^{3+}$

Dr. Satish Ingale

Numerade Educator

01:49

Problem 3

A solution may contain any of the four Group III cations considered in this experiment. Treatment of the solution with ClO- in alkaline medium yields a yellow solution and a colored precipitate. The acidified solution is unaffected by treatment with $\mathrm{NH}_{3}$. The colored precipitate dissolves in nitric acid; addition of excess $\mathrm{NH}_{3}$ to this acidic solution produces only a blue solution. On the basis of this information, which Group III cations are present, absent, or still in doubt? State your reasoning. Note: For "paper unknowns" such as this one, confirmatory tests are usually not included, and you do not need to provide any. The information provided here, without confirmatory tests, is sufficient to clearly indicate the presence or absence of some of the Group III ions studied in this experiment, while leaving others in doubt.

Present _____
Absent _____
In doubt _____

Eileen Sullivan

Numerade Educator

Problem 1

Problem 2

Problem 3