lecture 13 - chem

lecture 13 - chem - General Analytical Chemistry II...

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General & Analytical Chemistry II 1011-216 Winter 2008/2009 Lecture 13
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General & Analytical Chemistry II Rate Laws for Multiple Reactants When a reaction involves more than one reactant the rate law will contain the products of the concentration of the reactants raised to a power. Ex. The rate law for the reaction of oxalic acid with potassium permanganate (H 2 C 2 O 4 ( aq ) and KMnO4( aq )) is: Rate = k[H 2 C 2 O 4 ] x [KMnO 4 ] y k = rate constant x = reaction order for oxalic acid y = reaction order for potassium permanganate x + y = overall order for the reaction
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General & Analytical Chemistry II Working With Rate Laws The reaction C 2 H 4 + Br 2 C 2 H 4 Br 2 was determined to have the rate law: rate = k[C 2 H 4 ][Br 2 ] ½ For [C 2 H 4 ] = [Br 2 ] = 0.25 M the rate was measured as rate = 1.8x10 -3 mol/L.s Q1: What is the value of the rate constant, k? Q2: If the reaction mixture were diluted by a factor of four, what would the rate be?
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General & Analytical Chemistry II Rate Laws for Multiple Reactants - Example Rate = k [NH 4 + ] x [NO 2 - ] y Approach: 1) From experiment 1 and 2, obtain y. 2) From experiment 2 and 3, obtain x. 3) From x, y and any set of concentrations obtain k.
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