Question

Why do we measure the initial rate of a reaction?

Answer 1

The rate decrease as the reacants are used up.
The initial rate is measured as this the fastest rate and only that you actually know concentration of reactant. because the reaction is Rapid and subtract concentration quickly decline.

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Answer by cp

Answer 2

The rate decreases as the reacants are used up. The initial rate is measured as this is the fastest rate and the only time that you actually KNOW the concentrations of the reactants. This is because the reaction is rapid and the substrate concentration quickly declines......

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