[kylefinchsigmate]

I recall that there was a way to convert the k you got from a pseudo first order reaction to the k you would get under second order conditions.  Here's the scoop:

I'm doing a study where I got a k of .0012 M-1 s-1 from a second order plot and then I did it under pseudo1st order conditions and I got .00012 M-1 s-1.  I'm thinking from the difference of an order of magnitude the two aren't necessarily comparable and I don't have access (i.e. it's not in the NMR room) to my physical chem text book so I hope someone can help me quick.

*hearts*

KF

[Yggdrasil]

This reply probably isn't quick enough to help you, but maybe it will be useful to someone:

The units of a 1st order reaction constant should be s^-1.  This is why the rate constants of 1st and 2nd order reactions aren't comparable; they have different units.

[kylefinchsigmate]

Yeah.  That should have been obvious in the NMR room 

[kylefinchsigmate]

Ah.  Actually, you just take K₁ and divide it by the concentration of the excess reagent in M.  This will get you an extrapolated (and possibly wrong) K₂.