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# gradient of concentration against 1/time for first order watch

1. If the order of reaction is r=k[A][B]

A and B both have a first order of reaction.

Does this mean they will both have the same gradient for concentration against 1/time? Or can the gradient be different?
2. bump
3. Hey,

For the rate equation r=k[A][B]

The overall order is the sum of the individual orders.
But you can say the reaction order wrt (with respect to) A is 1 and wrt B is also 1.

Source: MChem student
4. As you've pointed out the reaction is first order with respect to both A and B. First order reactions follow an exponential depemdamce on time, rather than 1/t. If you like I can show you the maths for this, but it requires you to have done very basic differential equations.

In any case the gradients may be different, as they wil depend on the concentrations of the other species.

Hope this helps!

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Updated: March 6, 2013
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