Unit 1 - Chem Lecture 6 - reduction 6 8 7 8 4 4 MnO4-2...

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MnO4-2 MnO4- + MnO2 +6 8- +7 8- 4- +4 oxidation reduction O2 + Mn(CN)6-4 Mn(CN)6-3 0 +2 6- +3 6- oxidation H CN +1 1-
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Zn + NO3- Zn2+ + NH4+ oxidation reduction 0 +5 -6 +4 -3 1 2 NO2- + Al NH3 + AlO2- reduction oxidation +3 0 -3 +3 +3 -4 -4 3 HCrO4- + CH3CH2OH Cr3+ + CH3COOH reduction oxidation +1 +6 -8 -1 +1
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CH3 ----- C ----- O ----- H H | | H O || CH3 ----- C ----- H CH3 ----- C ----- O ----- H O || 0 0 -1 +1 +1 -1 +1 -2 +1 } NET CHARGE: -1 -2 +1 0 0 -1 +2 } NET CHARGE: +1 -2 +2 +1 -2 NET CHARGE: +3 +1 } Oxidation Oxidation
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10H3O+ + NO3- + 8e- NH4+ + 13H2O HALF REACTION BALANCED CHARGES NO. OF ELECTRONS RELEASED AND GAINED ARE THE SAME 4Zn 4Zn+2 + 8e- 10H3O+ + NO3- + 8e- NH4+ + 13H2O 1 2 3 4 8e - 0 +5 -3 +2 2e- - Zn + NO3- Zn2++ NH4+ Zn Zn+2 + 2e- NO3- + 8e- NH4+ BALANCE CHARGES TO DO SO, MULTIPLY BY 4 1 ADD AND 3 4 10H3O+ + 4Zn + NO3- NH4+ + 13H2O + 4Zn+2
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NO2- + Al NH3 + AlO2- 6e- 3e - +3 0 -3 +3 HALF REACTION Al 3e- + AlO2- OXIDATION CHARGE BALANCE 4OH- + Al M 3e- + AlO2- ATOM BALANCE 4OH- + Al M 3e- + AlO2- + 2H2O NO2- + 6e- NH3 CHARGE BALANCE NO2- + 6e- NH3 + 7OH- HALF REACTION ADD AND 5H2O + NO2- + 6e- NH3 + 7OH- 2 ELECTRONS GAINED = ELECTRONS LOST 8OH- + 2Al 6e- + 2AlO2- + 4H2O 1 2 x = 2 5H2O + NO2- + 6e- NH3 + 7OH- ATOM BALANCE 3 3 2 8OH- + NO2- + 2Al + 5H2O NH3 + 2AlO2- + 7OH- + 4H2O 1
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