Horvath Practice Problems 16

Horvath Practice Problems 16 - — A stopping technique...

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3 DETERMINATION OF RATE LAWS Concentrations [ I ] are measured not rates. To obtain the rate from the concentration we must examine how the concentration changes with time 1 ν I d [ I ] dt That is we must measure [ I ] as a function of time and f nd the rate of change of this concentration curve. The rates of chemical reactions vary enormously from sub- seconds to years. Consequently no one experimental technique can be used. For slow reactions (hrs/days) almost any technique for measuring the concentration can be used. For medium reactions (min) either a continuous monitor- ing technique or a stopping technique can be used
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Unformatted text preview: — A stopping technique used rapid cooling or destruc-tion of the catalysts to stop a reaction at a given point. • Very fast (sec/subsec) reactions cause problems because the reaction goes faster than one can mix the reactants. Di f erential methods based on the rate law Methods based directly on the rate law rely on the determina-tion of the time derivative of the concentration. 1. Method of initial velocities • for v = k [ A ] x [ B ] y rate laws. DETERMINATION OF RATE LAWS 15...
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