Here's why:
* Definition: Molar absorptivity represents the ability of a substance to absorb light at a specific wavelength. It's a measure of how strongly a molecule absorbs light per unit concentration and path length.
* Beer-Lambert Law: This law states that the absorbance of a solution is directly proportional to the concentration of the absorbing species and the path length of the light beam through the solution:
* A = εbc
* Where:
* A is absorbance
* ε is molar absorptivity
* b is path length
* c is concentration
From the Beer-Lambert Law, we can see that if the absorbance changes, it's due to a change in concentration or path length, not molar absorptivity.
In summary, molar absorptivity is an intrinsic property of a substance and does not change with its concentration.
