Chapter 11, Problem 11.68P

Interpretation Introduction

Interpretation:

The effect of concentration in the titration of weak base with a strong acid has to be plotted for a family of titration curves of $\text{50}\text{.0}\text{mL}$ $\text{of 0}\text{.0200}\text{M}\text{B}$ with $\text{0}\text{.100}\text{M}\text{HCl}$ has to be plotted.

Concept Introduction:

Titration of weak base with strong acid:

The pH of weak base is $\text{8}\text{.0}$, when we are titrating a weak base (B) with strong acid. At the beginning of the titration the initial pH of the solution is approximately that of the weak acid in water. All the weak acid is neutralized and converted to its conjugate base at the reach of equivalence point.

Spreadsheet Equation for titration of diprotic with strong acid.

$\varphi \equiv \frac{{\text{C}}_{\text{a}}{\text{V}}_{\text{a}}}{{\text{C}}_{\text{b}}{\text{V}}_{\text{b}}}\text{=}\frac{{\text{α}}_{{\text{BH}}^{\text{+}}}+\frac{\left[{\text{H}}^{\text{+}}\right]\text{-}\left[{\text{OH}}^{\text{-}}\right]}{{\text{C}}_{\text{b}}}}{\text{1-}\frac{\left[{\text{H}}^{\text{+}}\right]\text{-}\left[{\text{OH}}^{\text{-}}\right]}{{\text{C}}_{\text{a}}}}$

Where,

${\text{C}}_{\text{a}}$=initial concentration

${\text{C}}_b$=final concentration

${\text{V}}_{\text{a}}$=volume of the acid

${\text{V}}_{\text{b}}$= volume of the base

${\text{α}}_{{\text{BH}}^{\text{+}}}$=acid dissociation constant.

$\varphi$ =fraction way to equivalence point.