***MUST SHOW WORK FOR POINTS*** 1. If a current of 777.7 mA is passed through an

Question

***MUST SHOW WORK FOR POINTS***

1. If a current of 777.7 mA is passed through an electrochemical cell for 27.09 minutes, what charge, in coulombs, is passed through the cell?

Charge passed through the cell = coulombs

2. Suppose that the electrochemical cell consists of two copper electrodes immersed in a copper(II) sulfate solution. At which electrode, anode or cathode, does oxidation occur?

The oxidation occurs at the??

3. Do you expect that this electrode will increase or decrease in mass as the electrolysis proceeds?

The mass of the electrode will ...

4. Calculate the change in the mass of copper at the anode or cathode if the charge calculated above is passed through the cell described. Enter your answer as a positive quantity in mg.

Mass change at the electrode = mg

***MUST SHOW WORK FOR POINTS***

Explanation / Answer

1) Charge in coulombs = i (amp) x t (sec) = 0.7777 x 27.09 x 60 = 1264.07 C

2) The oxidation occurs at the Anode.

3) The mass of the electrode will decrease.

4) w = (E/F) x i x t = (31.7/96500) x 1264.07 = 0.415 g = 415 mg

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