Chapter 11, Problem 11.74P

Interpretation Introduction

Interpretation:

Absorbance of $20mL$ solution made of indicator and benzene $-$ $1,2,3-$ tricarboxylic acid      is treated with $20.0mL$ aqueous $KOH$ that molarity of aqueous $KOH$ has to be calculated.

Concept introduction:

Beer-Lambert’s law states that the intensity of light absorbed by a substance dissolved in a completely transmitting solvent is directly proportional to the concentration of the substance and the path length taken by the light while travelling in the solution.

It is mathematically expressed as,

$A=\text{ log}\left(\frac{I_0}{I}\right)=\epsilon lc$

Where,

$\begin{array}{l}A=\text{ Absorbance}\\ I_0=\text{ intensity of incident radiation}\\ \text{I}\text{= intensity of trasmitted radiation}\\ \epsilon \text{= molar extinction co-efficient}\\ \text{l}\text{= pathlength of the light}\\ \text{c}\text{= concentration of the solution}\end{array}$