1. Substances X, Y, and Z can all act as oxidizing agents. In this solution, X i

Question

1. Substances X, Y, and Z can all act as oxidizing agents. In this solution, X is red, Y is green, and Z is blue. In the reactions they undergo they are reduced to X-, Y-, and Z-, all of which are colorless. When a solution of X is mixed with one containing Y- ions, the color changes from red to green.

Which species is oxidized? ______

Which speces is reduced? _______

When a solution of X- is mixed with one containing Z- ions, the solution remains red.

Is X a better oxidizing agent than Y? _____

Is X a better oxidizing agent than Z? _____

Arrange X, Y, and Z in order of increasing strength as oxidizing agents.   

______________ > _____________ > ________________

weakest strongest

2. You are given a colorless unknown solution that contains one salt from the following set: NaX, NaY, NaZ. In solution, each salt dissociates completely into the Na+ ion and the anion X-, Y-, or Z- whose properties are given in question 1. The Na+ ion is inert. Assuming you have access to solutions of X, Y, and Z, write a simple produre (in the form of a flowchart) for determining the identity of the salt that is present in your unknown.

Explanation / Answer

1. When a solution of X reacts with Y- ions, the color changes from red to green which means the solution now contains Y and X becomes an ion.

Reaction: X + Y- ----> X- + Y

Which species got oxidised? Y

Which species got reduced? X

When a solution containing X reacts with Z- ions , there is no color change because X fails to oxidise Z

Is X a better oxidising agent than Y ? Yes

Is X a better oxidising agent than Z? No

Z>X>Y

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