Acids and Bases

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue.
The substance in the beaker

• is a base.
• has a neutral pH.
  
• is an acid.
• does not have a pH.

Which of the following is a base?

• orange juice
• water
• vinegar
• dishwashing detergent

The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?

• 3
• 9
• 7
• 5

 Which of the following is an acid?

• shampoo
• baking soda
• orange juice
• water

What would be considered the weakest base? 

• 8
• 14
• 7.8
• 11.6

Many cleaning solutions are bases. Which of the following is a property of most bases?

• feels slippery
• white color
• can only be liquid
• tastes sour

Which is the stronger acid?

• pH 1
• pH 4
• pH 8
• pH 13

Tastes bitter.

• Acids
• Bases
• Salts
• All

What is the pH of a neutral substance?

• 0
• 5
• 7
• 10

Which statement is true when acids and bases are mixed together?

• acids become stronger
• bases become stronger
• there is no change
• they neutralize each other