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Sample Exercise 20.4 Describing a Voltaic Cell The oxidation-reduction reaction $Cr_2O_7^{2-}(aq) + 14H^+(aq) + 6I^-(aq) \longrightarrow 2Cr^{3+}(aq) + 3I_2(s) + 7H_2O(l)$ is spontaneous. A solution containing $K_2Cr_2O_7$ and $H_2SO_4$ is poured into one beaker, and a solution of KI is poured into another. A salt bridge is used to join the beakers. A metallic conductor that will not react with either solution (such as platinum foil) is suspended in each solution, and the two conductors are connected with wires through a voltmeter or some other device to detect an electric current. The resulting voltaic cell generates an electric current. Indicate the reaction occurring at the anode, the reaction at the cathode, the direction of electron migration, the direction of ion migration, and the signs of the electrodes.

          Sample Exercise 20.4
Describing a Voltaic Cell
The oxidation-reduction reaction
$Cr_2O_7^{2-}(aq) + 14H^+(aq) + 6I^-(aq) \longrightarrow 2Cr^{3+}(aq) + 3I_2(s) + 7H_2O(l)$
is spontaneous. A solution containing $K_2Cr_2O_7$ and $H_2SO_4$ is poured into one beaker, and a solution of KI is poured into another. A salt bridge is used to join the beakers. A metallic conductor that will not react with either solution (such as platinum foil) is suspended in each solution, and the two conductors are connected with wires through a voltmeter or some other device to detect an electric current. The resulting voltaic cell generates an electric current. Indicate the reaction occurring at the anode, the reaction at the cathode, the direction of electron migration, the direction of ion migration, and the signs of the electrodes.

sample exercise 204 describing a voltaic cell the oxidation reduction reaction cr2o72 aq 14haq 6i aq longrightarrow 2cr3aq 3i2s 7h2ol is spontaneous a solution containing k2cr2o7 and 70066

Added by Eric T.

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