AP Chemistryhardmcq1 pt
Which metal should be chosen to cathodically protect an iron pipe?
A.Mg (E° = −2.37 V)
B.Cu (E° = +0.34 V)
C.Ag (E° = +0.80 V)
D.Au (E° = +1.50 V)
Explanation
Core Concept
A sacrificial anode must oxidize more easily than iron (E° = −0.44 V). Magnesium's much lower potential makes it corrode first, sparing the iron.
Correct Answer
AMg (E° = −2.37 V)
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