Rate constant from rate-concentration graph
Why can't you obtain the rate constant from the gradient of a rate-concentration curve of a second-order reaction but you can via the gradient of a rate-concentration curve of a first-order reaction? I know that for the second order reaction the rate constant would change although I'm not sure how this makes the method wrong assuming the rate constant can change 🙂
Does the value of the rate constant have to be constant? 😂
Does the value of the rate constant have to be constant? 😂
Original post by Freedom physics
Why can't you obtain the rate constant from the gradient of a rate-concentration curve of a second-order reaction but you can via the gradient of a rate-concentration curve of a first-order reaction? I know that for the second order reaction the rate constant would change although I'm not sure how this makes the method wrong assuming the rate constant can change 🙂
Does the value of the rate constant have to be constant? 😂
Does the value of the rate constant have to be constant? 😂
The rate constant is errr constant. It only changes with temperature.
Rate = k[A]x
The second order reaction gives a curve.
Rate = k[A]2
You can plug in values of rate at any given concentration to find the rate constant.
The first order graph is a straight line. Once again simply plug in values to find 'k'.
So why do you need to plot a graph of rate against concentration squared in order to find k for a second order reaction? Is it just because tangents are unreliable? 😄
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