Suddenly, the Periodic Table contains a new group containing elements A, B, and

Question

Suddenly, the Periodic Table contains a new group containing elements A, B, and C. In aqueous solution, A is turquoise in color, B is orange, and C is pink. Elements A, B, and C potential oxidizing agents in that they can accept electrons and be reduced to the corresponding anions A^-, B^-, and C^-. Sodium salts of these anions are always colorless in aqueous solution. OBSERVED: When a solution of A is mixed with a solution of C^-, the color changes from turquoise to pink according to A + C^- rightarrow A^- + C Which chemical species is oxidized in this reaction? _____ Which chemical species is reduced? ____ Which species is an oxidizing agent? ___ OBSERVED: When a solution of A is mixed with a solution of B^-, the color remains turquoise according to A + B^- rightarrow A + B^- Is elements A a better oxidizing agent than C?_____ Is elements A a better oxidizing agent than B? ___ Is element B a better oxidizing agent than C? _____ Arrange A, B, and C in order of increasing strength as oxidizing agents: (the weakest) ____

Explanation / Answer

To identify the salt present in your unknown you can use this simple trial and error method to
determine the results. Add the solutions of neutral elements (say A) if it does not oxidize the
unknown then you can draw the conclusion that the corresponding neutral solution salt is the
unknown ( i.e) NaA). But if it does oxidize then it shows that other two salts might be the
unknown ( i.e) NaB or NaC ). In this manner you can conclude the results by repeating
the same procedure by adding different solutions of neutral elements.

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