2CLabManual201303

Instead we can combine the molecular property and the

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Unformatted text preview: necessary one could measure what might be called an "effective path length" for each cuvette by measuring the absorbance of a solution of some absorber whose true molar absorptivity has already been measured, but we do not have to do this here. Instead, we can combine the molecular property and the effective path length of the cell being used for all the measurements into a new constant, *, whose magnitude is valid only for the particular system (absorber and cuvette) under study. Beer's Law then takes the simpler form A = *C. (Note that the way it is defined here * must have dimensions M-1 because absorbance is dimensionless.) We shall henceforth distinguish the four different * values by two-letter identifying subscripts: namely, GG, GR, RG and RR. The meanings of these combinations are as follows: GG = Green solution examined at the wavelength of the Green absorption maximum GR = Green solution examined at the wavelength of the Red absorption maximum RG = Red solution examined at the wavelength of the Green absorption maximum RR = Red solution examine...
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