Name pm apm nn (circle 230 Sp15 PREP6 Blank p 8 1) Balance the following net ion

Question

Name pm apm nn (circle 230 Sp15 PREP6 Blank p 8 1) Balance the following net ionic redox reaction in acid (aq) a) Balance the reduction half-reaction in acid. b) Balance the oxidation half-reaction in acid. c) Balance the overall reaction in acid. Consider a standard cell based on this spontaneous overall reaction with 100 mL of solution each half cell. How will the following changes affect the AE of the cell? Circle one response in each box. e) Adding KIO to the anode: Exchanging the electrodes in d) Adding KIO4(s) to the the half-cells. cathode AE will become more positive AE will become more positive AE will become more positive AE will not change AE will not change AE will not change AE will become more negative AE will become more negative AE will become more negative h) Diluting both half cells with Increasing the pH of the ce g) Letting electrons pass through the cell. water to half their initial ons: AE will become more positive AE will become more positive AE will become more positive AE will not change AE will not change AE will become more negative AE will not change AE will become more negative AE will become more negative

Explanation / Answer

1) Reduction half cell

2IO4- + 16 H+ + 7e ==> I2 + 8H2O

2) Oxidation half cell

2S2O32- ==> S4O6 2- + 0.5 e

Multiply 1. by 0.5 and 2. by 7 to cancel electrons and add to get final balanced redox equation

IO4- + 8H+ + 14S2O32- ==> 0.5 I2 + 4H2O +  7S4O6 2-

  

  

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