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

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