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The absorption spectra and pKa-value p-metoksifenola. P3070401

You can get the concept of:
Ground and excited states of molecules, equation Henderson-Hasselbalch, Lambert's law, Photometry.

Principle:
For weak acids, the position and importance Ka pKa, which characterize the equilibrium dissociation can be identified in the ground state using photometric measurements for solutions with different values of pH.