Acid–base Titrations
Overview
How do you find out exactly how much acid neutralises a given amount of alkali? A titration answers this with great precision, measuring volumes to a fraction of a millilitre. It is one of the most important practical techniques you will learn.
In this lesson you will learn how a titration is carried out using a burette, a pipette and an indicator, how the end-point is judged by a colour change, and how the results are used to find an unknown concentration. Careful technique is the heart of an accurate result.
Objectives
- Describe an acid-base titration to include the use of a: (a) burette (b) volumetric pipette (c) suitable indicator.
- Describe how to identify the end-point of a titration using an indicator.
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Lesson Evaluation
Congratulations on completing the lesson on Acid–base Titrations. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which piece of apparatus delivers a precisely measured, variable volume? A. Pipette B. Burette C. Beaker D. Test tube Answer: B
- The point at which the acid exactly neutralises the alkali is the: A. Start-point B. Mid-point C. End-point D. Boiling point Answer: C
- The end-point of a titration is shown by: A. A temperature rise B. A colour change of the indicator C. Bubbles of gas D. A precipitate Answer: B
- A pipette is used to measure a: A. Variable volume B. Fixed volume C. Mass D. Temperature Answer: B
- Why is a titration usually repeated? A. To use more acid B. To obtain concordant results for accuracy C. To change the indicator D. To warm the solution Answer: B
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