In relation to concentration, what is the effect of an increase in absorptivity coefficient?

In relation to concentration, what is the effect of an increase in absorptivity coefficient?

• A. Decreases absorption
• B. Increases absorption
• C. No effect on absorption
• D. Fluctuates absorption

Answer: (B)

Absorbance grows with a higher absorptivity coefficient because in the Beer-Lambert relationship A = ε l c, increasing ε (with path length l and concentration c fixed) directly increases A. A higher ε means the substance absorbs light more strongly at that wavelength, so more light is absorbed and less is transmitted (transmittance T = 10^(-A)). The molar absorptivity is a constant that reflects how efficiently a species absorbs light, typically with units of L mol^-1 cm^-1; a larger value means the sample appears darker at that wavelength for the same amount of material.

Absorbance grows with a higher absorptivity coefficient because in the Beer-Lambert relationship A = ε l c, increasing ε (with path length l and concentration c fixed) directly increases A. A higher ε means the substance absorbs light more strongly at that wavelength, so more light is absorbed and less is transmitted (transmittance T = 10^(-A)). The molar absorptivity is a constant that reflects how efficiently a species absorbs light, typically with units of L mol^-1 cm^-1; a larger value means the sample appears darker at that wavelength for the same amount of material.