[Ebelvonde]

I've done an absorbance plot for CuCl₂ at different concentrations. It's basically linear as expected, but slightly curves above and below 0.1M (I did a dilution series from 0-0.2M) is this because of the solvent used (water and some glycerol) or is because the equilibrium is shifted to produce more/less Cu²⁺ ions? I've looked but can't find anything concrete. Thanks!

[Corribus]

What is your optical density at the concentrations in question, and which way is the curvature?
The Beer-Lambert law breaks down at high concentrations.