Acids and Bases

Lesson 6.2

Acids and Bases

(Alef 103-104)

What are acids?

• Acids are substances that contain hydrogen atoms and release hydrogen ions (H+) when dissolved in water.

• They have the following properties: 1) turn blue litmus paper to red, taste sour and react with metals to form hydrogen gas.

• The following are some known acids and their uses:

• Hydrochloric acid - used to digest food in the stomach

• Nitric acid - used to make fertilizers for plants.

• Sulfuric acid - used in making car batteries

• Citric acid - found in citrus fruits such as lemon, lime and oranges.

Multiple Select

When I see an acid, I can always touch it.

• Yes

• No

• Not sure

WHAT ARE BASES?

WHAT ARE BASES?

A base is a substance that contains oxygen and hydrogen pairs and releases hydroxide ions (OH-) when dissolved in water.

Properties of Bases:

1. They turn red litmus paper to blue.

2. They taste bitter

3. They are slippery.

Multiple Choice

Which of these are examples of a base?

• soap

• shampoo

• dishwashing liquid

• all of these

Multiple Choice

When a red litmus paper is used to test a base, it will turn into

• blue

• red

• yellow

USES OF BASES

1. Used to make cement

2. Used as cleaning agents

3. Used for stomach pains such as antacids

4. Used for baking

Multiple Choice

Is egg an example of base?

• Yes because it's slippery.

• Yes because it taste bitter when raw

• both are correct

Multiple Choice

I can touch base anytime.

• No

• Yes

• Not sure.