The group III ions are separated from each other by taking advantage of the fact that two of the ions formamphoteric hydroxides.a. Which ions form an amphoteric precipitate.b. For one of the two ions you listed in a., write the equation for the precipitation of the ion by the addition of OH–ion, and the reaction that takes place when an excess of the OH–is added.

Question
Asked Mar 26, 2019

The group III ions are separated from each other by taking advantage of the fact that two of the ions form
amphoteric hydroxides.

a. Which ions form an amphoteric precipitate.

b. For one of the two ions you listed in a., write the equation for the precipitation of the ion by the addition of OH–
ion, and the reaction that takes place when an excess of the OH–
is added.

check_circleExpert Solution
Step 1

An amphoteric hydroxide is defined as a hydroxide that behaves as both a weak acid as well as a weak base. In other words, an amphoteric hydroxide reacts with both strong acids and bases to form a weak acid or a weak base.

Step 2

The separation of Group III cations is based on the fact that two of the group cations form amphoteric hydroxides and can dissolve in excess of the strong base. The remaining cations in the group form insoluble hydroxides or sulfides in basic medium.

Step 3

The group III cations are iron (II), iron (III), cobalt (II), nickel (II...

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