Which of the following species will be able to reduce #Cu^(2+)# to #Cu# ? (A). #I_2# (B). #Ni# (C). #Al^(3+)# (D). #Ag# ?
Standard electrode potential
They should be listed most negative to most positive. The relevant values are listed here:
The most powerful oxidisers have the greatest ability to take in electrons. They have the most +ve
In the same way the most powerful reducers have the greatest ability to push out electrons. They have the most -ve
A useful rule is "Bottom left will oxidise top right".
Or "Top right will reduce bottom left"
So which of the species will be able to reduce
- anything above and on the right.
This leaves us with
n.b This refers to standard conditions. By altering these we can often drive the reaction in the direction we want - particularly if the
The reaction may also be hampered by a high activation energy.