Discussion
What is an isosbestic point?
Answer: C
When a substance exists in two interconverting forms, there is generally a wavelength at which both have the same absorptivity, so the total absorbance there is independent of how the two are proportioned. It is neither a maximum, an equivalence point nor an error minimum. Measuring at such a point gives the total concentration regardless of the equilibrium, which is a useful trick when the ratio of forms cannot be controlled. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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