When measuring voltages using electrodes, Why voltages differ for different solutions and why voltages change with...

When measuring voltages using electrodes, Why voltages differ for different solutions and why voltages change with time? and which electrode of the two that you used (Al and Cu) oxidizes more and which oxidizes less? Which direction (from one electrode to another) do electrons flow when two electrodes are connected?

Expert Solution

a)

from nernest equation :

Ecell = Eo -0.05916 / n * log Q

Q = [product] / [reactants]. if the solution concentration changes Ecell also changes. different solution means different concentration

b) current = charge / time

voltage = current x resistance

voltage = ( charge / time ) x resistance

from the relation above volatge depends on time if time increases volatge decreases it is due to consumption of concentrations of solutions in the given half cells

c)

Al is oxidise more and Cu is oxidise less

electrons flow from Al to Cu

Al electrode potential is lesser than Cu. so Al readily loose electrons .

queen_honey_blossom answered 2 years ago

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