Vernier Software and Technology
Vernier Software & Technology

Microscale Acid-Base Titration

Figure from experiment 36 from Chemistry with Vernier

Introduction

A titration is a process used to determine the volume of a solution needed to react with a given amount of another substance. In this experiment, you will titrate hydrochloric acid solution, HCl, with a basic sodium hydroxide solution, NaOH. The concentration of the NaOH solution is given and you will determine the unknown concentration of the HCl. Hydrogen ions from the HCl react with hydroxide ions from the NaOH in a one-to-one ratio to produce water in the overall reaction:

{{\text{H}}^{\text{ + }}}{\text{(aq)  +  C}}{{\text{l}}^{\text{ - }}}{\text{(aq) N}}{{\text{a}}^{\text{ + }}}{\text{(aq)  +  O}}{{\text{H}}^{\text{ - }}}{\text{(aq)}} \to {{\text{H}}_{\text{2}}}{\text{O(1)  +  N}}{{\text{a}}^{\text{ + }}}{\text{(aq)  +  C}}{{\text{l}}^{\text{ - }}}{\text{(aq)}}

When HCl solution is titrated with NaOH solution, the pH value of the acidic solution is initially low. As base is added, the change in pH is quite gradual until close to the equivalence point, when equimolar amounts of acid and base have been mixed. Near the equivalence point, the pH increases very rapidly. The change in pH then becomes more gradual again, before leveling off with the addition of excess base.

Objectives

In this experiment, you will

  • Perform a microscale acid-base titration.
  • Monitor pH.
  • Determine the approximate concentration of the acid used in the titration.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Chemistry with Vernier »

Experiment 36 from Chemistry with Vernier Lab Book

<em>Chemistry with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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