Question

Why is it necessary to keep the temperature constant, but not the concentration of the reactants when determining the rate law expression through the initial rate method?

Answer 1

It is necessary to keep the temperature constant, but not the concentration of the reactants when determining the rate law expression.

What is the rate law expression?

A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation or rate law equation.

A frequent way for determining rate laws is the concept of beginning rates. The method includes determining the starting rate of a reaction, as the name initial rate method would imply. To observe how the reaction rate varies, the measurement is repeated for several sets of beginning concentration conditions.

When establishing the rate law expression using the initial rate technique, it is required to maintain a constant temperature but not the reactant concentration because the rate constant fluctuates with temperature. k=Ae^-Ea/RT.

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