Acids and Bases

What is the pH range of an acid?

• 4-6

• 1-7

• 1-6

• 8-14

What would happen to blue litmus paper if it came into contact with an acid?

• It would turn red

• It would turn green

• It would stay blue

• It would turn pink

Which of the following pH values would be the weakest acid?

• 1

• 3

• 5

• 6

What would happen to red litmus paper when it encounters a base?

• It turns blue

• It stays red

• It turns purple

• It turns green

A substance is found to have the following characteristics:

Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water

In what category would the substance be classified?

• acid

• base

• enzyme

• fatty acid

Which of the following statements is correct?

• Blue litmus paper turns red when placed in a base.
• Red litmus paper turns blue when placed in a base.
• Blue litmus paper stays blue when placed in an acid.
• Red litmus paper stays red when placed in a base.

What would be considered the weakest base? 

• 8
• 14
• 7

• 11

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid