Why does the concentration to volume curve resemble x^2?

[xpack]

Tomorrow I have an exam and my teacher gave us a hint to understand why the concentration to volume curve looks like the formula x² but I can't find it anywhere's can someone take a quick second to explain.

C = mol/L

 

[PhaseShifter]

I'm not sure which equation you're looking for. Could you give an example of a problem that would use it?