# Beer’s Law

## Beer’s Law Definition:

**λ _{max}** (lambda max) is given by the

**equation describing the relationship between molar absorptivity (e), absorbance (A), concentration (C) in (mol/L), and path length (l ):**

_{ }## Beer’s Law Explained:

**λ _{max }**is dependent on the amount of conjugation in a particular organic molecule. The more highly conjugated a compound, the less energy it requires to elicit excitation. Recall the formula:

From the equation, you can deduce that energy (E) is inversely proportional to wavelength (**λ**). Thus, longer wavelengths correspond to lower energy, and vice versa. We know that the more conjugated a compound, i.e. more double and triple bonds, the longer the wavelength, and thus the lower the energy.