   Chapter 15, Problem 5ALQ

Chapter
Section
Textbook Problem

# Sketch two pH curves, one for the titration of a weak acid with a strong base and one for a strong acid with a strong base. How are they similar? How are they different? Account for the similarities and the differences.

Interpretation Introduction

Interpretation:

The pH curve for the titration of a weak acid (HA) with a strong base (NaOH) and one for a strong acid with a strong base is to be sketched. The similarities and differences between the two curves are to be explained.

Concept introduction:

Titrations are recorded with a help of various titration curves, in which the volume of the titrant (known solution) is taken as an independent variable and the pH of the solution is considered to be the dependent variable as it changes on basis of the composition of the involved two solutions.

To determine: The pH curve for the titration of a weak acid (HA) with a strong base (NaOH) and one for a strong acid with a strong base; the similarities and differences between the two curves.

Explanation

Explanation

The pH curve for the titration of a weak acid (HA) with a strong base is as follows.

The pH curve for the titration of a weak acid (HA) with a strong base is,

Figure 1

The initial pH value prior to the addition of the base is low. The value of pH increases rapidly with an increase in the concentration of the base.

The point at which the base present is just enough to neutralize the initial acid is termed as the equivalence point. After this, the increase is the pH value slows down.

The pH curve for the titration of a strong acid with a strong base is as follows.

The pH curve for the titration of a strong acid with a strong base is,

Figure 2

The initial pH value prior to the addition of the base is low. The value of pH increases gradually with an increase in the concentration of the base.

The point at which the base present is just enough to neutralize the initial acid is termed as the equivalence point. After this, the increase is the pH is sharp

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