Molar Absorptivity Constant Calculator

Formula

The formula to calculate the molar absorptivity constant is:

\[ \varepsilon = \frac{A}{c \cdot l} \]

Where:

\( \varepsilon \) is the Molar Absorptivity Constant (L/mol*cm)
\( A \) is the Absorbance (unitless)
\( c \) is the Concentration of the Solution (M)
\( l \) is the Path Length (cm)

What is Molar Absorptivity Constant?

The molar absorptivity constant, also known as the molar extinction coefficient, is a measure of how well a chemical species absorbs light at a particular wavelength. It is an intrinsic property of the substance and is used in Beer-Lambert law to relate the absorbance of a solution to its concentration and the path length of the cuvette in spectrophotometry.

Example Calculation

Let's assume the following values:

Absorbance (A): 0.5
Concentration (c): 0.01 M
Path Length (l): 1 cm

Using the formula to calculate the molar absorptivity constant:

\[ \varepsilon = \frac{0.5}{0.01 \times 1} = 50 \text{ L/mol*cm} \]

The molar absorptivity constant is 50 L/mol*cm.