Lesson 2.2: Properties of Acids and Bases

You just learned some properties of acids and bases, but there are more.

Read Properties of Acids and Bases as well as table 4.2 on page 64 in your textbook.

Question 1. What new properties of acids and bases did you learn?

 

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Scientists do not use the taste of acids and bases to identify them. You must never taste a chemical in a laboratory! There are other safer ways to identify acids and bases.

Read Identifying Acids and Bases on page 64 of your textbook.

Question 2. What is an indicator?

Question 3. What is the source of litmus?

Question 4. Is it possible for a plant flower to be a completely different colour only because it is grown in acidic or basic soil conditions?

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Answers to Questions:

Question 1. What new properties of acids and bases did you learn?

Acids react with metals (bases do not).

Acids have a pH less than 7, but bases have a pH greater than 7.

Both acids and bases are corrosive and conduct electricity.

 

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Answers to Questions:

Question 2. What is an indicator?

An indicator is a substance that changes colour in the presence of an acid or a base.

Question 3. What is the source of litmus?

Lichens are the source of litmus.

Question 4. Is it possible for a plant flower to be a completely different colour only because it is grown in acidic or basic soil conditions?

Yes, the hydrangea flower is pink when grown in acidic soil and blue when grown in basic soil.


Click on the page forward to continue Lesson 2.