Lesson 1 Review Quiz – Acids and Bases

According to the Brønsted–Lowry definition, a base is a substance that:

• Produces OH⁻ ions in water

• Donates a proton (H⁺)

• Accepts a proton (H⁺)

• Neutralizes an acid by definition

Which of the following is the conjugate base of HCO₃⁻?

• H₂CO₃

• CO₃²⁻

• OH⁻

• H₂O

What is the pH of a solution with [H⁺] = 1.0 × 10⁻⁶ M?

• 4

• 6

• 7

• 8

Which solution is the most basic?

• pH = 2

• pH = 7

• pH = 9

• pH = 13

Pure water is neutral at all temperatures and always has a pH of 7.0.

• True

• False

Conjugate acid–base pairs differ by exactly one proton (H⁺).

• True

• False

Write the conjugate acid of NH₃.

• NH₄⁺

• NH₂^-

• NH₃⁺

• NH₂⁺

• 10

• 4

• 7

• 12

9. Coffee has a pH of 5 and tomato juice has a pH of 4. Which is more acidic and by how many times is the hydrogen ion concentration greater?

• Tomato juice is more acidic; [H⁺] is 10 times greater than in coffee.

• Coffee is more acidic; [H⁺] is 10 times greater than in tomato juice.

• Tomato juice is more acidic; [H⁺] is 5 times greater than in coffee.

• Coffee is more acidic; [H⁺] is 5 times greater than in tomato juice.

The body must carefully regulate the pH of blood around 7.4 because:

• Enzyme function and cellular processes depend on a stable pH.

• Blood pH has no effect on body functions.

• A higher pH always improves health.

• The body can function well at any pH level.