Unit 5 Test (Acids/Bases/Solubility)

If an acid is combined with a base of equal strength, the result will most likely be

• a neutral solution.
• a stronger acid.
• impossible to tell without testing the pH.
• a stronger base

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 and a piece of red litmus paper into the substance. Blue litmus paper stays blue, but red litmus paper turns blue. The substance in the beaker

• is a base.

• has a neutral pH.

• is an acid.

• does not have a pH.

Bases feel...

• slippery

• gritty

• hot

• cold

Match each pH with the correct category:

• 7.0

• weak base

• 5.5

• weak acid

• 13.5

• neutral

• 1.0

• strong acid

• 8.5

• strong base

An acid will make ​ (a)   .

A base will make ​ (b)   .

• blue litmus paper turn red
• red litmus paper turn blue

In a neutralization reaction, what are the products of a reaction between an acid and a base?

• Another acid and base
• Carbon dioxide and a salt
• Water and a salt
• Either two acids or two bases

Acids form​ (a)   when mixed with water, and they taste ​ (b)   .

Bases form ​ (c)   when mixed with water, and they taste ​ (d)   .

• H+
• sour
• OH-
• bitter

Match the following

• NaOH

• Neutral

• H₂O

• Base

• H₂SO₄

• Acid

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

• 13

• 9

• 7.5

• 5

Jake has an unknown substance in a beaker. He wants to determine the relative pH of the unknown substance. He places a piece of blue litmus paper into the substance, and the litmus paper turns red.

The substance in the beaker

• is a base.

• has a neutral pH.

• is an acid.

• does not have a pH.