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Initial rates a level chemistry

Why are initial rate used to calculate order and not rate at any point on graph?
The ans is that at the start we know the concentrations but if it’s a conc time graph gradient, don’t we know the concentration at any point on the graph?
Original post by Aeshakhan
Why are initial rate used to calculate order and not rate at any point on graph?
The ans is that at the start we know the concentrations but if it’s a conc time graph gradient, don’t we know the concentration at any point on the graph?

Yes, and you could use the gradient of the tangent to the curve to determine the rate at this point.
Reply 2
Original post by charco
Yes, and you could use the gradient of the tangent to the curve to determine the rate at this point.

But the answer is that we only know the concentrations at the start

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