Classifying Acids and Bases

Which of the following word pairs correctly completes the sentence below?

_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

• Acids; pH less than 7

• Acids; pH greater than 7

• Bases; pH greater than 7

• Bases; pH less than 7

Litmus paper can tell you if a solution is acidic, neutral or basic by changing color when placed in a solution. If you test a acid with litmus paper, it will turn ____________.

• purple

• red

• blue

• pink

Which of the following formulas below are acids? ( Select ALL that apply)

• H₂SO₄

• HCl

• NaOH

• CaCO₃

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

• strong base

• a stronger acid.

• impossible to tell without testing the pH.

• a neutral solution.

When bases are added to water, what kind of ions are produced?

• H⁺

• OH^-

• A^-

• B⁺

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

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

Pure water has a pH of 7. Pure water _______.

• is a base

• is a neutral substance

• could be either an acid or a base

• is an acid

Which of the following is a basic solution?

• Household ammonia

• HCl dissolved in water

• Vinegar

• Pure 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.