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29 March, 05:25

Why does absorbance data relate more conveniently to concentration than transmission data

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  1. 29 March, 09:15
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    For quantitative work the absorbance is more useful than the transmittance because it is directly proportional to concentration. The relationship is known as the Beer-Lambert Law and is:

    A = abc

    where a (molar absorptivity or extinction coefficient) is a constant for a given absorbing chemical species, b is the radiation path length through the sample (measured in cm), and c is the stoichiometric molar concentration (mol/L) of the absorbing species.
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