Acids and Bases

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

HF is...

• an acid

• a base

• a salt

• an ionic compound

HNO₂

• a base

• a salt

• an acid

• an ionic compound

KOH is ...

• an acid

• a base

• a salt

• an ionic compound

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.

Which of these pH values represent an acid?

• 4

• 8

• 10

• 12

If I add more chicken soup to this setup, what will happen to the pH?

• It will increase and get closer to 7

• It will decrease and get closer to 0

• It will stay the same and not change

If I add more water to this setup, what will happen to the pH?

• It will increase and get closer to 7

• It will decrease and get closert to 0

• It will stay the same and not change

Milk is a very weak acid. What might its pH value be?

• 6.5

• 7.8

• 4.2

• 12.2

When an acid is dissolved in water, it turns red litmus paper blue.

• True

• False