 Chemistry Help Forum Calculating potential of a solution Sep 3rd 2017, 05:53 AM #1 TheWizard Junior Member   Join Date: Sep 2017 Location: Belgium Posts: 1  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?)  Tags nernst equation, redox reaction Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 