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Asked by Aiyanna

How is molar absorptivity used to determine concentration from absorbance?
8 years ago

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Answered by DrBob222
A = ebc.
A = Absorbance
e = molar absorptivity = constant
b = cell length
c = concn in mols/L

Measure A of a known concentration. Knowing b and c, solve for e. Then measure A of an unknown. Plug in b and e, solve for c in mols/L. Convert to ppm or whatever units you want.
8 years ago

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