Use the References to access important values if needed for this question. Enter

Question

Use the References to access important values if needed for this question. Enter electrons as e Use smallest possible integer coefficients for ALL reactions If a box is not needed, leave it blank A voltaic electrochemical cell is constructed in which the anode is a I, | r'half cell and the cathode is a HgHg half cell. The half-cell compartments are connected by a salt bridge. Write the anode reaction. Write the cathode reaction. Write the net cell reaction. In the external circuit, electrons migrate t the I, I electrode Hg electrode. In the salt bridge, anions migrate the Hg compartment the I I compartment

Explanation / Answer

anode reaction

     2I^- (aq) -----------------------> I2(g) + 2e^-

cathode reaction

    Hg^2+ (aq) + 2e^- ----------------> Hg(l)

    2I^- (aq) -----------------------> I2(g) + 2e^-

    Hg^2+ (aq) + 2e^- ----------------> Hg(l)

------------------------------------------------------------------------

Hg^2+ (aq) + 2I^- (aq) ----------------> I2(g) + Hg(l)    net cell reaction

in the external circuit electrons migrate from the I2/I^- electrode to the Hg^2+ / Hg electrode

in the salt bridge anions migrate from the Hg^2+ /Hg compartment to the I2/I^- compartment.

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