draw voltaic cells setup
solid electrode in soln containing ions of that metal
saltbridge
wire with Vm
which half cell do oxidation and reduction occur in?
oxidation - the negative electrode (has the more negative E standard value)
reduction - the positive electrode (has the more positive E standard value)
NO PR
when would a platinum electrode be used?
if all species in half cell are aqueous - both ions in soln at 1 moldm^-3
what must you check before combining half eqns?
same no of electrons on each side
eqn for cell potential
cell potential = most positive E standard - most negative E standard
what is a SHE?
standard hydrogen electrode, given an e standard value of 0
where do the H+ ions come from in the SHE?
acid
why is a salt bridge necessary?
completes the circuit
movement of K+ and NO3- ions stop the buildup of charge
will a good oxidising agent have a very positive or very negative E standard value?
good oxidising agents will have a very positive E standard value
