Multiple Choice
In the reaction 3 BrO-(aq) → BrO3-(aq) + 2 Br-(aq), a plot of 1/[BrO-] vs. time is linear. What is the order of the reaction with respect to BrO-?
15. Chemical Kinetics
Rate Law
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Based on the given reaction data, what is the rate law for the reaction between OCl⁻ and I⁻?
A
Rate = k[OCl⁻][I⁻]²
B
Rate = k[OCl⁻]
C
Rate = k[OCl⁻]²[I⁻]
D
Rate = k[OCl⁻][I⁻]
Verified step by step guidance1
Identify the general form of the rate law for the reaction. The rate law expresses the rate of a reaction in terms of the concentration of the reactants raised to a power. For a reaction between OCl⁻ and I⁻, the general form is Rate = k[OCl⁻]^m[I⁻]^n, where m and n are the orders of the reaction with respect to OCl⁻ and I⁻, respectively.
Examine the given rate law: Rate = k[OCl⁻][I⁻]². This suggests that the reaction is first order with respect to OCl⁻ (m = 1) and second order with respect to I⁻ (n = 2).
Compare the given rate law with the options provided. The given rate law matches the option Rate = k[OCl⁻][I⁻]², indicating that this is the correct rate law based on the provided data.
Understand that the rate constant k is a proportionality constant that is specific to the reaction at a given temperature. It does not affect the order of the reaction but is necessary for calculating the rate.
Conclude that the correct rate law for the reaction between OCl⁻ and I⁻, based on the given data, is Rate = k[OCl⁻][I⁻]², as it accurately reflects the orders of reaction with respect to each reactant.
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