The ions A^-, B^-, and C^- all form colorless aqueous solutions. Their molecular

Question

The ions A^-, B^-, and C^- all form colorless aqueous solutions. Their molecular counterparts, however, form brilliantly colored solutions, where A_2 is green, B_2 is blue, and C_2 is red. When a student mixes the anions C^- and A^- with a solution of B_2, the following results were obtained: B_2 + 2C^- rightarrow red solution (B_2 oxidized C^- to C_2) B_2 + 2 A^- rightarrow blue solution (B_2 does not oxidize A^- to A_2) Rank A_2, B_2 and C_2 in order of increasing oxidizing strength. Would the following reaction occur? A_2 + 2 C^- rightarrow C_2 + 2 A^-. Explain why or why not. Devise a single-step test that one could use to analyze an unknown solution containing one of the three anions. A^-, B^-, or C^- using either A_2, B_2 or C_2 as a test solution. Explain how and why this would work.

Explanation / Answer

a)

Oxidising strength will be

C2 < B2 < A2

b)

Here A2 is oxidizing C-

since oxidizing strength of A2 is more than C2,

This is possible

c)

add B2 to the solution:

If solution turns red, C- is present

If solution is blue, A- is present

If there is no change, B- is present

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