Identifying Acids and Bases

Litmus paper turns from red to blue in

• acids

• bases

• water

Phenolphthalein turns from pink to colorless in

• acids

• bases

• water

A chemical that changes color in acids and bases is called

• an indicator

• a metal

• a non-metal

Which one of the following is an example of a base? (a)  

• orange juice

• dish soap

• vinegar

• lemons

Which of the following is a property of both acids and bases?

• They both taste sour.

• They both feel slippery.

• They both conduct electricity.

• They both turn litmus paper the same color.

Tags

DOK Level 2: Skill/Concept

Bases, also known as ​ (a)   will turn litmus paper ​ (b)   . This is because they have a pH ​ (c)   . They taste ​ (d)   .

• alkali and OH-

• blue

• above 7

• bitter

• below 7

• H+

• red

• sour

What is the effect of adding an acid to a base?

• The solution becomes more acidic.

• The solution becomes more basic.

• The solution becomes neutral.

• The solution remains unchanged.

Tags

DOK Level 2: Skill/Concept

Tastes bitter: (a)  

• acids

• bases

• neutral

• pH paper

Bases do not react with ​ (a)   or carbonates, taste ​ (b)   , feel ​ (c)   , and turn ​ (d)   litmus paper ​ (e)   .

• metals

• bitter

• slippery

• red

• blue

• sour

• sweet

• dry

Which properties are bases? (select all that apply)

• Taste bitter

• Feels slippery

• Reacts with metals to produce hydrogen (H)

• Turns methyl red to yellow

• Turns litmus blue