A student constructs a galvanic cell that has a strip of iron metal immersed in

Question

A student constructs a galvanic cell that has a strip of iron metal immersed in a solution of 0.1M Fe(NO_3)_2 as one other half-cell and a strip of aluminum metal immersed in a solution of 0.1M Al(NO_3)_3 as the other half-cell. The measured cell potential is less than zero when the positive terminal of the voltmeter is attached to the aluminum strip and the negative terminal is attached to the iron strip. Which half-cell is the anode (Fe or Al)? Which half-cell is the cathode? Do the electrons flow from Al to Fe or Fe to Al? Which metal is more "active" Al or Fe?

Explanation / Answer

a) at Anode

Fe(s) --------> Fe2+(aq) +2e-(aq)

b)at cathode

Al3+(aq) +3e-(aq) --------> Al(s)

c) the electrons flow from Fe to Al

d)In terms of electrode potential, Aluminium is good reducing agent in comparison to iron.

Aluminium is more active

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