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Extinction coefficient

Extinction coefficient

(Science: chemistry) a constant used in the beer-lambert law which relates the concentration of the substance being measured (in moles) to the absorbance of the substance in solution (how well the substance in solution blocks light beamed through it from getting out on the other side).


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Re: molar extinction coefficient

Well done -- I promise that the next time you face this sort of graphical calculation, it will make more sense. And as you've found, it's all about the units.

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by jonmoulton
Tue Dec 04, 2012 4:22 pm
 
Forum: General Discussion
Topic: molar extinction coefficient
Replies: 10
Views: 6719

Re: molar extinction coefficient

Yes, that sounds too low, at least for those wavelengths where methyl red absorbs strongly. Did you correct your concentrations for the dilution you made as you mixed your stock solution into liquid prior to making the spectrometer measurement?

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by jonmoulton
Mon Dec 03, 2012 4:29 pm
 
Forum: General Discussion
Topic: molar extinction coefficient
Replies: 10
Views: 6719

Re: molar extinction coefficient

... cm-1 for methyl red....is this value not too small for the molar extinction coefficient though?

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by 2468
Sun Dec 02, 2012 2:38 am
 
Forum: General Discussion
Topic: molar extinction coefficient
Replies: 10
Views: 6719

pka

... (especially picture on p. 3 where you can see that the extinction coefficient is around 8000 M-1 cm-1) http://www-ec.njit.edu/~grow/Methylred.pdf

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by JackBean
Sat Dec 01, 2012 11:46 pm
 
Forum: General Discussion
Topic: pka
Replies: 6
Views: 3222

pka

Hey, :) need help working this out: pH: 4 molar extinction coefficient: 0.0187142857 m-1cm-1 absorbance at 500nm: 1.492 [Acid form]?? (work out using molar extinction ...

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by 2468
Fri Nov 30, 2012 10:45 pm
 
Forum: General Discussion
Topic: pka
Replies: 6
Views: 3222
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