Calculating potential of a solution
Hi
I'm having some trouble with the following problem:
Calculate the potential of a solution made by mixing equal volumes of 0.20M thallium(I)nitrate and 0.20M dibromine in 1M HCl. E°'(Tl3+/Tl+) = 0.77V en E°'(Br2(aq)/2Br) = 1.087V
The answer given is 0.934V
This is what I have so far:
TlNO3 > Tl+ + NO3
Tl3+ + 2e <> Tl+
Br2(aq) + 2e <> 2Br
Tl+ + Br2 <> Tl3+ + 2Br
The potentials that are given have this 'prime' above them so those are formal potentials (potentials when in certain conditions > in 1M HCl)
Ecell = E(cathode)  E(anode)
cathode is reduction(Br2 to 2Br) and anode is oxidation(Tl+ to Tl3+)
I feel like I should use the Nernst equation to calculate E(cathode) and E(anode) but I don't have the concentration of Tl3+ nor do I have the concentration of Br
How should I proceed, did I miss something?
All feedback is welcome!
(The question was originally in Dutch, this is my best attempt to a translation. How I use subscripts and superscripts so I can make my formulas more nice looking?)
