Acid-Base Titrations

Acid-Base Titrations

Author: carolyn fruin

Learning Targets:

  • I can describe how an acid-base indicator works.
  • I can explain how to carry out a titration.
  • I can calculate the molarity of a solution from titration data.
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Sample Math Problems from Titrations

Section C, D and E from the lab are represented here.

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Power Point - Titrations

This power point reviews neutralization reactions in general and describes how titration is used to calculate the molarity of an unknown acid or base.

Preparing for the Lab

This site explains the necessary background and concepts behind a laboratory titration. However, we will be using HCl to standardize the NaOH solution. Read through this lab description in preparation of our lab. Titration Lab Explanation

Please watch the 1 minute video explaining the steps in a titration. This will help you see what to expect.

Computer Tutorial - Titrations (strong acid/strong base)

This online tutorial describes a titration, how to perform it in the lab and how to use the date to solve for the quantity desired. You can ignore the pKa information as we will not be concerned with this in detail. CLICK HERE

Source: W. W. Norton & Company

Vinegar Titration Example

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Part B of the Titration Lab - Saniflush

Not the math for the problem, but this is how the world sees this weak acid cleaner.

Explaining the Titration Curve (strong acid + strong base)

A closer look using data at the titration curve of a strong acid and strong base. Remember, its all about moles of acid = moles of base.

Simulation - Practice with Titration

This simulation allows you to practice a titration. You can see the equipment, the set-up, how the pH changes over time, etc. Since you will be titrating later, this is a nice introduction to the concept.

As you interact with the simulation, please answer the following questions. These will be turned in along with other assigned materials.

  1. What is the name of the long tube holding the base? (We always want to sound smart on the first day of lab!)
  2. What happens to the pH as the base is added to the flask? Why?
  3. What are you noticing at the molecular level? Describe in detail what you see over time.
  4. Why did the slope increase so quickly near the "endpoint"?
  5. How many milliliters of base were added to reach the neutral pH of 7?
  6. Why did the pH continue to climb and then level off?
  7. Do all neutral solutions reach a pH of 7? Why or why not?

CLICK HERE to begin.

Source: McGraw-Hill

pH Indicators

What are common pH indicators?