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Question

http://www.saplinglearning.com/ibiscms/mod/bis view.php?i o c Florida Southern College C... x C chegg.com w Home Portal Q Your Sets Quizlet Chegg Study Guided S Your prezis Prezi RG Live Feed S Turnitin Florida S College Map sapling earning Given the measured cell potential, E is -0.3597 V at 25 °C in the following cell, calculate the Ce H+ concentration Pt (s)IH20g, 0.781 atm)IH (aq, 2+ (aq, 1.00 M)lcd (s) The balanced reduction half-reactions for the cell, and their respective standard reduction potential values, Eo, are as follows E 0.00 V 2 E 0.403 V Number Previous Give Up & View Solution Check Answer Next I Exit Hint Point Grad Desc Polic You c You c up on You c you g You in you ansW eTE O He O We C Tec 2:32 PM 4/22/2015

Explanation / Answer

Overall balanced reaction:-

Cd2+(aq) + H2(g) -------------> 2H+(aq) + Cd(s) ; E0cell = -0.403

Now, applying Nernst Equation:-

Ecell = E0cell - (0.0591/2)*log{[H+]2}/{[Cd2+]*[H2]}

or, -0.3597 = -0.403 - (0.059/2)*log{[H+]2}/{1*0.781}

or, log{{[H+]2}/0.781} = -1.468

or, {{[H+]2}/0.781} = 10-1.468 = 0.0341

or, [H+] = 0.1631 M

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