Chemistry / Chem 1635 · Atom · ~20 seconds
Overall Reaction Order
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A reaction's overall order is the sum of the individual orders of every reactant appearing in its rate law.
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The rate law rate = k[H+][OH−] is first order in each ion, an overall order of two.
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Overall order sums the exponents actually written in the rate law — a reactant absent from it contributes zero, not one.