redoc - REDOX REACTIONS In an acid/base reaction, protons...

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REDOX REACTIONS In an acid/base reaction, protons are transferred: AH + B A - + BH + We can make a table of individual acids and strengths. HCl Æ H + + Cl - pKa very low ImH + Æ H + + Im pKa = 7 HAc Æ H + + Ac - pKa = 4 NH 4 + Æ H + + NH 3 pKa = 10 Agents at the top, like HCl, are strong acids; it’s conjugate base, Cl - , is a very weak base and no amount of it will make it a strong base. At the bottom, NH 4 + is a weak acid, but its conjugate base is strong. Things near the middle, like His and imidazole, are modest acids and conjugate bases. Strong acids are at the top of the table, strong bases at the bottom. Protons tend to flow from protonated species at the top to unprotonated species below. In oxidation/reduction reactions, electrons are transferred A ox n+ + B red A red + B ox n+ In this reaction, A is reduced (gains e - s), and B is oxidized (loses e - s). A is the oxidizing agent, or oxidant B is the reducing agent, or reductant Break this into two half-reactions: A ox n+ + ne - Æ A red B red Æ B ox n+ + ne - The "propensity" to gain e
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This note was uploaded on 11/21/2011 for the course CS 329E taught by Professor Mitra during the Spring '11 term at University of Texas at Austin.

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redoc - REDOX REACTIONS In an acid/base reaction, protons...

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