Chapter 16A and 16B quiz (acids and bases)

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

• is a base

• is a neutral substance

• could never be an acid

• is an acid

Which of the following is true about acids and bases?

• The lower the pH, the stronger the acid

• the higher the pH, the stronger the acid

• The lower the pH, the more neutral the acid

Which type of ion does an acid produce when it is dissolved in water?

• oxide

• oxygen, O₂

• hydronium, H₃O⁺

• hydroxide, OH^-

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 turns red.

The substance in the beaker

• is a base.

• has a neutral pH.

• is an acid.

• does not have a pH.

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.

Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?

• strongly acidic
• slightly acidic
• strongly basic
• slightly basic

Which of the following are the characteristics of a BASE? (Choose 2 of these.)

• Very bitter in taste

• Liberate OH- ions when dissolved in water

• Have pH of less than 7

• Turns blue litmus red

According to the pH range given in the image,which substance is more acidic than lemon juice?

• Hydrochloric acid

• Cabbage

• Milk

• Milk Of Magnesia

Which among the following is not a base?

• NH3

• KOH

• HCl

• NH₄OH

What is the pH of a solution that has a [H+] of 2.5 x 10^-5?

• 4.6

• 2.5

• 5.0

• 7.0