Acids and Bases

Acids react with

• water to produce bases and salts
• salts to produce bases and water
• neither bases, salts nor water
• bases to produce salts and water

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.

Tags

NGSS.MS-PS1-2

Which of these pH values represent an acid?

• 4

• 8

• 10

• 12

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

• 6.5

• 7.8

• 4.2

• 12.2

Tags

NGSS.MS-PS1-2

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

• True

• False

Tags

NGSS.MS-PS1-2

Which of the following is an acid?

• vinegar

• bleach

• sugar in water

• starch in water

• toothpaste in water

Which of the following pH values represents a base?

• 2.1

• 4.6

• 6.8

• 8.1

The strongest bases have pH values close to

• 0

• 14

• 7

• 5

Which of the following is a base?

• baking soda in water

• orange juice

• vinegar

• lemonade

Ocean water is only slightly basic. What might its pH value be?

• 5

• 8

• 12

• 2