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Safari File Edit View History Bookmarks Window Help D. Tue 9:49 PM E session.masteringchemistry.com ecture Homework Item 1 session.masteringchemistry.com AL Item 26 PeagentMix2017 mp3 Resoure Item 1 Itom 26 Part A In add Write oquafons for the half-reactions that ccour at the anode and cathode for the electrolysis of each of the following aqueous reacti Express your answers as chemical equations separated by a comma. Identify all of the phases in your answer. of ele can be reacti the to Submit My Answers Give Up H20( Incorrect: Try Again Screen Shot 017-1...8.38 PM are Part B KCl Expross your answors as chemical squations separated by a comma. Identity all of the phases in your answor. Screen Shot 017-1..3.37 PM Submit My Answers Give Up Part C final mix Expross your answors as chemical squations separated by a comma. Identity all of the phases in your answor. Screen Shot 017-1...8.15 PM Submit My Answers Give Up Screen Shot 017-1.9.06 PM 0.27 pt 100% 29. Item 29

Explanation / Answer

You have to write out the potential oxidation and reduction reactions which can occur in the solutions. Then choose the reaction which will give the the greatest Ecell value (closest to being a positive value)

a)Ni(NO3)2 (aq)

When splitting up, you get Ni2+(aq) and NO3-(aq)

With the Nickel, these two reactions can potentially occur
Ni2+(aq) + 2e- -> Ni(s)
E = -0.23

H2O(l) + 2e- -> H2 + OH-
E = 0.41

With the nitrate ion, these two reactions can potentially occur
NO3-(aq) +4H+(aq) + 3e- -> NO(g) + 2H2O(l)
E = 0.96

2H2O(l) -> O2(g) + 4H+(aq) + 4e-
E = 0.82

Now, the reactions which will most likely occur must give the Ecell a positive value.
Therefore, the second chemical equation of each oxidation and reduction reaction will most likely occur.

Final answer
Reduction: NO3-(aq) + 4H+(aq) + 3e- -> NO(g) + 2H2O(l)
Oxidation: 2H2O(l) -> O2(g) + 4H+(aq) + 4e-

b) KCl(aq)
Reduction: 2H2O(l) + 2e- -> H2(g) + 2OH-(aq)
Oxidation: 2H2O(l) -> O2(g) + 4H+(aq) + 4e-

c) CuBr2 (aq)
Reduction: Cu2+ (aq) + 2e- -> Cu(s)
Oxidation: 2H2O(l) -> O2(g) + 4H+(aq) + 4e-

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