?A mixture of copper and gold metals that is subjected to electrorefining contains
Chapter 20, Problem 20.96(choose chapter or problem)
A mixture of copper and gold metals that is subjected to electrorefining contains tellurium as an impurity. The standard reduction potential between tellurium and its lowest common oxidation state, \(\mathrm{Te}^{4+}\), is
\(\mathrm{Te}^{4+}(a q)+4 \mathrm{e}^{-} \longrightarrow \mathrm{Te}(s) \quad E_{\mathrm{red}}^{\circ}=0.57 \mathrm{~V}\)
Given this information, describe the probable fate of tellurium impurities during electrorefining. Do the impurities fall to the bottom of the refining bath, unchanged, as copper is oxidized, or do they go into solution as ions? If they go into solution, do they plate out on the cathode?
Text Transcription:
Te4+
Te4+(aq) + 4 e- longrightarrow Te1s2 E^circ red = 0.57 V
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