Question
How do you differentiate between reaction rate and reaction rate constant. What is meant by the rate controlling step in a reaction?
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Answer
Difference between Rate of Reaction and Reaction Rate Constant
The rate controlling step in a reaction is the slowest step on which the rate of reaction depends.
| Rate of Reaction | Reaction rate Constant |
| 1. Rate of reaction is the change in concentration of a reactant or product per unit time. | 1. It is a constant of proportionality in the rate law equation and is equal to the rate of reaction when the molar concentration of each of the reactants is unity. |
| 2. The rate of reaction at any instant of time depends upon the molar concentration of the reactants at that time. | 2. The rate constant for a particular reaction at a particular temperature does not depend upon the concentrations of the reactants. |
| 3. Its unit is always moles litre-1 time-1 | 3. Its units depend upon the order of reaction. |
The rate controlling step in a reaction is the slowest step on which the rate of reaction depends.
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