Chapter 13.23, Problem 40P

Interpretation Introduction

Interpretation

Estimate the pK₄ of the acid has to be calculated.

Concept introduction:

UV/vis spectroscopy: It is deal with information about various compounds that have conjugated double, the UV light and visible light have jest the right energy to cause an electronic transition in a molecule that is to promote an electron from one molecular orbital to another higher energy.

$pH$: The pKa of a compound was determined using the UV/Vis spectroscopy if either the acidic from or the basic from of the compound absorbs UV or visible light.

Henderson-Hesselbalch equation: The acid lose a proton in an aqueous solution depends on the both the $\text{pKa}$ of the acid and the $pH$ of the solution, the relationship between the two is given by equation.

$pKa=pH+\log \frac{[HA]}{[A^{-}]}$