First of all, molar absorptivity is dependent on wavelength, so you either need to specify a wavelength or you need the entire spectrum.
When searching for absorptivity, it's often effective to search for the older name 'extinction coefficient'. Using that search term in Google, I found an absorption spectrum for thymol blue here (pdf).
First of all, molar absorptivity is dependent on wavelength, so you either need to specify a wavelength or you need the entire spectrum.
When searching for absorptivity, it's often effective to search for the older name 'extinction coefficient'. Using that search term in Google, I found an absorption spectrum for thymol blue here (pdf).
Just read them off the graph at Fig. 2. For the acid at 540 nm (are you sure thats the right wavelength? Its a weird wavelength to measure the acid form at) it looks like its about 0.05 L.(mol.cm)^-1, and for the base at 600 nm it looks like its about 0.85 L(mol.cm)^-1. You may want to measure that graph more precisely than my eyeball did.More
If you use the isbestic wavelength, you only find out how much thymol blue is in the solution; you dont find out the pH of the solution, which is the purpose of using the pH indicator.More
First of all, molar absorptivity is dependent on wavelength, so you either need to specify a wavelength or you need the entire spectrum.
When searching for absorptivity, it's often effective to search for the older name 'extinction coefficient'. Using that search term in Google, I found an absorption spectrum for thymol blue here (pdf).
First of all, molar absorptivity is dependent on wavelength, so you either need to specify a wavelength or you need the entire spectrum.
When searching for absorptivity, it's often effective to search for the older name 'extinction coefficient'. Using that search term in Google, I found an absorption spectrum for thymol blue here (pdf).
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