pH of Weak 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

Lemon juice is an example of  __________

• base

• acid

• neutral substance

Which is true?

• pH of less than 7 is basic; pH of more than 7 is acidic

• pH of less than 7 is acidic; pH of more than 7 is basic

Bases are what range on the pH scale?

• 0-6.99

• 7

• 7.1-14

• 0-14

Acids are what range on the pH scale?

• 0-14

• 0-6.99

• 7

• 7.1-14

When found in food, bases are _______.

• Sour

• Bitter

• Salty

• Soggy

pH 5 is considered to be a:

• weak base

• strong base

• weak acid

• strong acid

When red litmus paper turns blue...

• you are testing an acid

• you are testing a base

• you are testing a neutral

Which of the following is MOST acidic?

• 13

• 4

• 2

• 10

Is there is a substance that tests at pH 8.4, which is the best description?

• It is slightly acidic

• It is slightly basic

• It is highly acidic

• It is highly basic