? sic.ce age and from Use the R to access A standard galvanic cell is constructe

Question

? sic.ce age and from Use the R to access A standard galvanic cell is constructed with Crt | Cr and Cl, Cr half cell compartments connected by a salt bridge. Which of the following statements are correct? Hint: Refer to a table of standard reduction potentials (Choose all that apply.) ? Cr is oxidized at the anode. D Cr3 is reduced at the cathode. The anode compartment is the Cr3+Cr compartment. As the cell runs, anions will migrate from the Cr Cr compartment to the Cl-jCT compartment. In the external circuit, electrons flow from the Cr (Cr compartment to the Cl(Ct compartment.

Explanation / Answer

For a galvanic cell E°cell > 0

The two half cell reactions are

Oxidation reaction at anode

2Cr = 2Cr3+ + 6e-

Eox = 0.74 V

Reduction reaction at cathode

3Cl2 + 6e- = 6Cl-

Eox = 1.36 V

Overall cell reaction

2Cr + 3Cl2 = 2Cr3+ + 6Cl-

E°cell = 1.36 + 0.74 = 2.10 V

E°cell > 0

Cr is oxidized at anode

Cl2 is reduced at cathode

Anode compartment is Cr/Cr3+

Anions will migrate from Cl2/Cl- to Cr/Cr3+

Electrons flow from Cr/Cr3+ to Cl2/Cl-

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