exp15 (1) - Experiment 15 Chemical Kinetics Purpose The purpose of this experiment is to determine the rate of a chemical reaction(potassium

# exp15 (1) - Experiment 15 Chemical Kinetics Purpose The...

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Experiment 15 Chemical Kinetics
Purpose The purpose of this experiment is to determine the rate of a chemical reaction (potassium permanganate, KMnO 4 , + oxalic acid, H 2 C 2 O 4 ) as the concentrations are varied and to determine the rate law for the reaction.
Introduction For a reaction a A + b B c C + d D t [B] ) b 1 ( t [A] ) a 1 ( rate t [D] ) d 1 ( t [C] ) c 1 ( rate
Different Rates Average (this experiment) Initial (Experiment 17) Instantaneous
Rate Law Rate law---a relationship between concentrations and rate. For a reaction aA + bB products the rate law often takes the form Rate = k[A] x [B] y
Rate = k[A] x [B] y [A],[B]: molarities of A and B in solution x, y: orders with respect to A and B, respectively. (These orders might not correspond to coefficients from the balanced equation!) k: rate constant
What We’re Running 2 MnO 4 - + 5 H 2 C 2 O 4 + 6 H + 2 Mn 2+ + 10 CO 2 + 8 H 2 O We assume a rate law Rate = k [MnO 4 - ] m [H 2 C 2 O 4 ] n The rate law and rate constant are not affected by concentration.
Strategy One pair of experiments (assignments 1 and 2): [MnO 4 - ] is constant and [H 2 C 2 O 4 ] doubles.

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• Summer '15
• Chemistry, oxalic acid, 1.0 mL, 0.315 M, 0.755 M

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