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Unformatted text preview: CHEM 201 September 17, 2007 The attempt to explain the things he has failed at once before. The result was he said we didnt need to know it K w = [H][OH] = 1.0x10-14 pH = -log[H] pH + pOH = 14 HA (aq) + H 2 O (l) H 3 O (aq) + A (aq) K a = [H 3 O][A]/[HA] Oxidation-reduction Reactions o Oxidation loss of an electron (Reduction gain of an electron) A 2- A- + e- A- A- A A + A + A 2+ o Anode Oxidation Reducing Cathode o When a substance loses an electron it is an oxidation and it is called a reducing agent o When a substance gains an electron it is a reduction and it is called an oxidizing Agent How to do oxidation-reduction numbers o Assigning Oxidation Numbers Elements in there ground state: Charge = 0 Oxidation number = 0 Monatomic ion Oxidation number = charge Polyatomic ions Oxidation number for each element add to the charge SO 3 2- 4+(-2)(3) = -2 If an atom is oxidized or reduced another atom must be reduced or...
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This note was uploaded on 04/07/2008 for the course CHEM 201 taught by Professor Harris during the Fall '07 term at Bucknell.
- Fall '07