What is the reaction at the anode? The cathode? [2] b. In what direction are the electrons moving? [1] c. In which direction do the potassium ions migrate? The nitrate ions? [2]

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Chapter19: Electrochemistry
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Problem 19.123QP: An aqueous solution of an unknown salt of gold is electrolyzed by a current of 2.75 amps for 3.39...
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a. What is the reaction at the anode? The cathode? [2]

b. In what direction are the electrons moving? [1]

c. In which direction do the potassium ions migrate? The nitrate ions? [2]

Expert Solution
Step 1
  • The standard reduction potential of Zinc i.e. Zn+2|| Zn = - 0.763

The standard reduction potential of Ni+2 || Ni = -0.250

The reduction potential of Nickel ion is large and less negative hence, will reduce and Zinc will oxidize.

Reduction occurs at Cathode. Hence reaction at cathode.

Ni+2 + 2e- → Ni

Oxidation reaction at Anode

 Zn → Zn+2 + 2e-

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