Experiment 33 Prelaboratory Assignment Electrolytic Cells, Avogadro\'s Number 1.

Question

Experiment 33 Prelaboratory Assignment Electrolytic Cells, Avogadro's Number 1.) The standard reduction potential for the Cu" /Cu redox couple is +0.34 V; that for H,OH, OH at a pH of 7 is Lab Sec. Desk No. -0.41 V. For the electrolysis of a neutral 1.0 M CuSo, solution, write the equation for the half-reaction occurring at the cathode at standard conditions. 2, )n an electrolytic cell, reduction occurs at the (name of electrode) b. the anode is the (sign) electrode c. anions flow toward the (name of electrode) d. electrons flow from the (name of electrode) to (name of electrode) e. the cathode should be connected to the (positive/negative) terminal of the de power supply 17b 3. a. Identify a chemical tests) to determine if water is oxidized at the anode of an electrolytic cell. b. Similarly, identify a chemical tests) to determine if water is reduced at the cathode of an electrolytic oll 4. Very pure copper metal is produced by the electrolytic refining of blister (impure) copper. In the cell at right, label the de power anode, the cathode, and the polarity (+,- of each. -Blister 09.99% CuSO solution

Explanation / Answer

1) From the SRP values , Cu has more positive SRP, which means Cu has more tendency to undergo reduction .

Thus the reaction that occurs at cathodein neutral 1.0M CuSO4 solution is

Cu+2(aq) + 2e- -------------> Cu (s)

Cu+2 ions are reduced to copper which is deposited on cathode.

2)In an ELECTROLYTIC cell

a) Reduction occurs at CATHODE

b) Anode is POSITIVE electrode

c) anions flow towards ANODE

d) electrons flow from CATHODE to ANODE

e) cathode to the NEGATIVE and anode to the POSITVE terinal of DC power supply.

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