and returned to the containers where you found them. 1. Experimental Procedure f

Question

and returned to the containers where you found them. 1. Experimental Procedure for Electrolysis of Potassium lodide Solution Pre-Lab Questions for Electrolysis of Potassium lodide Solution In this part of the experiment, you will. try to figure out what reaction occurs when electrical current is passed through an aqueous solution of potassium iodide. You wil Chemistry IB Experiment I-4 71 consider the half-reactions at the anode and at the cathode separately. The only substances available as reactants are: K+ (aq),(aq),H20 (), Cu (s), and electrons (of course). You can either figure out the possible half-reactions using common sense, or you can select appropriate half-reactions from the table of standard reduction potentials in your textbook. 1. List 3 possibilities for the oxidation half-reaction. 2. List 2 possibilities for the reduction half-reaction. 3. For each of these half reactions, what would you expect to see if it were occurring? What products would form? Consider the possibilities of a color change, formation of a solid, formation of a gas (bubbles), a shift in the acid / base balance of the solution (which you could detect using an acid-base indicator), and the formation of elemental iodine (which you could detect using starch solution).

Explanation / Answer

1. possible oxidations:

Cu(s) = Cu+(aq) + e

I- (aq) = 1/2 I2 (g) + e

K(s) = K+ (aq) + e

2. reductions:

1/2 I2 (g) + e = I- (aq)

Cu+(aq) + e = Cu(s)

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