pH of Weak Acids and Bases

Which pH number ismost likely to turn red litmus paper blue?

• 4

• 6

• 1

• 10

Sodas or soft drinks are considered to be:

• Basic

• Neutral

• Acidic

• None of the above

When blue litmus paper turns red...

• you are testing a base

• you are testing a neutral

• you are testing an acid

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

• Both of the solution are bases

• Both of the solution are acids

• The Baking soda is an acid and the Bleach is a base

• The baking soda is a base and the Bleach is an acid.

A pH of 3 is how many times more acidic than a pH of 5?

• 2

• 20

• 10

• 100

A chemical has a pH = 6. It would be best described as

• Strong acid

• Strong base

• Weak acid

• Weak base

Substances that taste sour like lemon juice tend to be classified as

• Acids

• Bases

• Salts

• All

What does pH measure?

• the amount of hydrogen (H⁺) ions

• the amount of hydroxide (OH^-) ions

• amount of water

• all of the above

A substance that is a base has more OH- ions than H+ ions.

• True

• False

As one moves down the pH scale from 14 to 1, what happens to the concentration of H+ in the solution?

• concentration of H+ decreases

• concentration of H+ increases

• concentration of H+ stays the same