You have a solution of 0.01 M #Ni(NO_3)_2#, absorbance was 0.4 at 400 nm with a path length of 1 cm. Using Beer's Law, how do you calculate #epsilon# for this solution?

1 Answer

Rearrange the Beer-Lambert law equation for ε and plug in the values.

Explanation:

The Beer-Lambert law equation is:

A = ε . c . l

Where:

A = absorbance
ε = extinction coeffecient
l = pathlength

Rearranging for ε

ε = A / (c . l)

I'll leave you to plug in the values.

More information on spectrophotometry can be here.

Oh, and don't forget the units...

The video below shows an experiment using a spectrophotometer.