Question 1

Which piece of laboratory equipment is shown in all four images and is essential for delivering precise volumes of titrant during an acid–base titration?

Accepted Answer

Burette

Question 2

In the context of acid–base titrations, what does the color change observed in the Erlenmeyer flask indicate?

Accepted Answer

The titration has reached the endpoint, where the indicator changes color.

Question 3

If phenolphthalein is used as the indicator, which color change would you expect at the endpoint of a strong acid–strong base titration?

Accepted Answer

Colorless to pink

Question 4

Which of the following best explains why different indicators are used for different titrations?

Accepted Answer

Indicators are chosen so that their color change (endpoint) occurs as close as possible to the equivalence point pH of the titration.

Question 5

During a titration, the solution in the flask changes from colorless to pink. What does this indicate about the pH of the solution if phenolphthalein is used as the indicator?

Accepted Answer

The pH is above 8.2.

Question 6

Which of the following statements is TRUE regarding the use of methyl orange as an indicator in a titration?

Accepted Answer

It changes color in the pH range of approximately 3.1 to 4.4.

Question 7

A student performs a titration and observes the solution in the flask change from orange to red. Which indicator is most likely being used?

Accepted Answer

Methyl orange

Question 8

Why is it important to select an indicator whose endpoint is as close as possible to the equivalence point of the titration?

Accepted Answer

To minimize the error in determining the volume of titrant required for neutralization.

Question 9

In a titration experiment, what is the purpose of the Erlenmeyer flask?

Accepted Answer

To contain the sample solution being analyzed.

Question 10

Which of the following best describes the endpoint of a titration?

Accepted Answer

The point at which the indicator changes color, signaling the completion of the titration.

Lesson 8.7: Acid–Base Titration: Principles, Calculations, and Indicators

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