$$\text{pH} + \text{pOH} = 14$$

$$\text{pOH} = -\log [\text{OH}^-]$$

$$K_w = [\text{H}_3\text{O}^+][\text{OH}^-]$$

Question 1

Which of the following statements best describes the relationship between pH and pOH at 25°C?

Accepted Answer

$$	ext{pH} + 	ext{pOH} = 14$$

Question 2

A solution has a pH of 3. What is its pOH at 25°C?

Accepted Answer

$$	ext{pOH} = 11$$

Question 3

Which of the following substances is most basic according to the pH scale shown in the images?

Accepted Answer

1 M sodium hydroxide (NaOH)

Question 4

If a solution has a pOH of 2, what is its pH at 25°C?

Accepted Answer

$$	ext{pH} = 12$$

Question 5

Which of the following best describes a solution with a pH of 6?

Accepted Answer

Weakly acidic

Question 6

What is the [OH$$^-$$] concentration in pure water at 25°C?

Accepted Answer

$$1.0 	imes 10$$^{-7}$$ M

Question 7

Which of the following is true for a solution with pH = 7 at 25°C?

Accepted Answer

[H$$_3O$^+$$] = [OH$$^-$$]

Question 8

A sample of cola has a pH of 2. What is the [H$$_3O$^+$$] concentration?

Accepted Answer

$$1.0 	imes 10$$^{-2}$$ M

Question 9

Which of the following household substances is closest to neutral on the pH scale?

Accepted Answer

Pure water

Question 10

If a solution has a pH of 10, what is its [OH$$^-$$] concentration at 25°C?

Accepted Answer

$$1.0 	imes 10$$^{-4}$$ M

Question 11

Which of the following best describes the taste and litmus test result for a typical base?

Accepted Answer

Bitter taste, turns litmus paper blue

Question 12

A solution has [H$$_3O$^+$$] = $$1.0 	imes 10$$^{-5}$$ M. What is its pH?

Accepted Answer

5.0

Question 13

Which of the following is a correct statement about strong acids?

Accepted Answer

They completely dissociate in water.

Question 14

Which of the following is the correct formula for calculating pOH?

Accepted Answer

$$	ext{pOH} = -\log [	ext{OH}^-]$$

Question 15

A solution has a pOH of 5. What is the [OH$$^-$$] concentration?

Accepted Answer

$$1.0 	imes 10$$^{-5}$$ M

Question 16

Which of the following is true for a solution with [OH$$^-$$] = $$1.0 	imes 10$$^{-2}$$ M at 25°C?

Accepted Answer

The solution is basic.

Question 17

Which of the following best describes the relationship between Ka and acid strength?

Accepted Answer

The larger the Ka, the stronger the acid.

Question 18

If the Ka of an acid is $$1.0 	imes 10$$^{-5}$$, what is its pKa?

Accepted Answer

5.0

Question 19

Which of the following is the correct expression for the ion-product constant of water ($$K_w) at 25$$°C?

Accepted Answer

$$K_w = [	ext{H}_3	ext{O}^+][	ext{OH}^-]$$

Question 20

Which of the following best describes the taste and litmus test result for a typical acid?

Accepted Answer

Sour taste, turns litmus paper red

Chapter 17: Acids and Bases – Properties, Definitions, and Quantitative Relationships

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