1. Balance each of the following redox reactions using the half-reaction method.

Question

1.   Balance each of the following redox reactions using the half-reaction method. Show your work.

P.S. OK, this should definitly show this time.

Explanation / Answer

Oxidation states are : 1. Cr2O7^2- (+6) + CH3CH2(OH) (-1) -----------> Cr3+ + CH3C(=O)OH (+3) 2. MnO4- (+7) + C6H9OH (0) -----------> MnO2 (+4) + C6H8O (+2) a)In acidic medium : oxidation half :CH3CH2(OH) - 4e- ---------> CH3C(=O)OH ]x 3 reduction half : Cr2O7^2- + 6e- ---------> 2 Cr3+ ] x 2 net : 3CH3CH2(OH) + 2Cr2O7^2- + 16H+ ---------> 3CH3C(=O)OH + 4 Cr3+ +11H2O b ) In basic medium : Reduction half : MnO4- + 3e- ------> MnO2 ] x 2 Oxidation half : C6H9OH - 2e- ---------> C6H8O ] x 3 net : 2MnO4- + 3C6H9OH ------> 2MnO2 + 3C6H8O + 2OH- + 2H2O

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