Posted by **Sara** on Wednesday, February 23, 2011 at 9:18pm.

Hi

I am doing a lab report for the kinetic behaviour of phenolphthalein in aqueous solutions. I did two runs, each with different concentrations of OH-, and Cl-. I have graphed x, ln x, and 1/x to determine which one has the most linear plot to determine what order the reaction is, but for one run, I have determined that the reaction was first order and for the second run, I have determined that the reaction was second order.

My question is, is this possible? I'm not sure if first order should apply to both runs because it is essentially the same reaction, just with different concentrations.

Please advise.

Thanks

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