Absorbance, Transmittance, and Beers Law

Transmittance and percent transmittance are two parameters that can be displayed on the readout. 

Absorbance then is a parameter that increases linearly with concentration and is important for quantitative analysis. If the analyst measures transmittance, he or she must convert it to absorbance via Equation (7.12) 

Light from Source Transmitted Light from Source Transmitted 

FIGURE 7.19 Illustration of the definitions of I and I0. The intensity of the light that has passed through a blank solution is designated I0. The intensity of the light that has passed through the analyte solution is less than I0 and is designated I. 

What is the absorbance (A) of a sample that has a percent transmittance (%T) of 49.6% Solution 7.9 

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