16-09-10 - Add 6H+ to the left side to make it even And add...

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Thursday, September-16-10 (number in brackets are oxidization numbers) - Large (+) oxidation state -> strong oxidizer o Perchlorates cl(+7) o Permanganates MN(+7) o Dichromate’s Cr(+6) o Nitric acid N(+5) o Sulphuric acid s(+6) - (-) oxidation state -> no oxidizing properties o Metal oxides/chlorides/sulphides o Identify the redox species – MN reduced so oxidised o How many electrons are transferred? 10 electrons o Balancing redox reactions 1. Identify and mass balance redox species 2. Balance e- transfer 3. Balance ionic charges with h+ or oh- 4.Balance O and H with H20 5.include counter ions (other methods in section 5.5) Read chapter 5 carefully for redox – do not understand - Redox reaction in acidic solution o So 3 2- + Mno 4 - SO 4 2- + Mn 2+ Gain of +5 electrons from beginning to end Loss of 2 electrons from beginning to end Charges go in order of 4, 7, 6, 2
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Put a multiple of 5 and 2 to make reaction balanced o 5So 3 2- + 2Mno 4 - 5SO 4 2- + 2Mn 2+ Left hand side has a charge of 12- and the right side has a charge of 6e-
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Unformatted text preview: Add 6H+ to the left side to make it even And add 3h 2 0 on the right side to even out the 6H+ added to even out the charges of the redox reaction Balanced reaction = o 6h + + 5So 3 2-+ 2Mno 4- 5SO 4 2-+ 2Mn 2+ + 3H 2-Redox reaction in a basic solution o S + ClO- SO 3 2-+ Cl- Gain of 2 electrons from left to right Loss of 4 electrons from left to right Charges go in order from 0,1,4,-1 Multiply by 2 to make reaction balanced o 2OH- + S + 2ClO- SO 3 2-+ 2Cl-+ H 2 0 Left hand side has a charge of -2 and right hand side has a charge of -4 Add 2OH to the left side to balance out and then add 1 h20 to balance out the elements-Redox reactions with organic compounds o Very reactive and very spontaneous and dangerous o Glycerol with potassium permanganate is the example...
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This note was uploaded on 10/22/2010 for the course PHYSICS 1D03 taught by Professor N. mckay during the Spring '08 term at McMaster University.

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16-09-10 - Add 6H+ to the left side to make it even And add...

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