Q: Given a solution with $$[\mathrm{H^+}] = 1.0 \times 10$$^{-4}$$ M, what is the pH of the solution?

$$\mathrm{pH} = -\log(1.0 \times 10$$^{-4}$$) = 4$$

Q: If a solution has a pH of 3.0, what is the $$[\mathrm{H^+}]$$ concentration?

$$[\mathrm{H^+}] = 1.0 \times 10$$^{-3}$$ M

Q: A solution has $$[\mathrm{OH^-}] = 5.2 \times 10$$^{-8}$$ M. What is the $$[\mathrm{H^+}]$$ concentration?

$$[\mathrm{H^+}] = \frac{1.0 \times 10$$^{-14}$$}{5.2 \times 10$$^{-8}$$} = 1.9 \times 10$$^{-7}$$ M

Q: What is the relationship between $$[\mathrm{H^+}]$$ and $$[\mathrm{OH^-}] in $$water at 25°C?

$$[\mathrm{H^+}] \times [\mathrm{OH^-}] = 1.0 \times 10$$^{-14}$$

Q: A solution has $$[\mathrm{H^+}] = 3.0 \times 10$$^{-5}$$ M. What is the pH?

$$\mathrm{pH} = -\log(3.0 \times 10$$^{-5}$$) \approx 4.52$$

Q: If a solution has $$[\mathrm{OH^-}] = 1.7 \times 10$$^{-6}$$ M, what is the $$[\mathrm{H^+}]$$ concentration?

$$[\mathrm{H^+}] = \frac{1.0 \times 10$$^{-14}$$}{1.7 \times 10$$^{-6}$$} = 5.9 \times 10$$^{-9}$$ M

Question 1

Which of the following best describes a strong acid?

Accepted Answer

An acid that completely dissociates (ionizes) to produce $$\mathrm{H^+}$$ ions.

Question 2

Given a solution with $$[\mathrm{H^+}] = 1.0 	imes 10$$^{-4}$$ M, what is the pH of the solution?

Accepted Answer

$$\mathrm{pH} = -\log(1.0 	imes 10$$^{-4}$$) = 4$$

Question 3

If a solution has a pH of 3.0, what is the $$[\mathrm{H^+}]$$ concentration?

Accepted Answer

$$[\mathrm{H^+}] = 1.0 	imes 10$$^{-3}$$ M

Question 4

A solution has $$[\mathrm{OH^-}] = 5.2 	imes 10$$^{-8}$$ M. What is the $$[\mathrm{H^+}]$$ concentration?

Accepted Answer

$$[\mathrm{H^+}] = \frac{1.0 	imes 10$$^{-14}$$}{5.2 	imes 10$$^{-8}$$} = 1.9 	imes 10$$^{-7}$$ M

Question 5

What is the relationship between $$[\mathrm{H^+}]$$ and $$[\mathrm{OH^-}] in $$water at 25°C?

Accepted Answer

$$[\mathrm{H^+}] 	imes [\mathrm{OH^-}] = 1.0 	imes 10$$^{-14}$$

Question 6

If the pH of a solution is 8.3, is the solution acidic or basic?

Accepted Answer

Basic

Question 7

A solution has $$[\mathrm{H^+}] = 3.0 	imes 10$$^{-5}$$ M. What is the pH?

Accepted Answer

$$\mathrm{pH} = -\log(3.0 	imes 10$$^{-5}$$) \approx 4.52$$

Question 8

If a solution has $$[\mathrm{OH^-}] = 1.7 	imes 10$$^{-6}$$ M, what is the $$[\mathrm{H^+}]$$ concentration?

Accepted Answer

$$[\mathrm{H^+}] = \frac{1.0 	imes 10$$^{-14}$$}{1.7 	imes 10$$^{-6}$$} = 5.9 	imes 10$$^{-9}$$ M

Question 9

Which of the following statements about weak acids is correct?

Accepted Answer

A weak acid dissociates only slightly in aqueous solution.

Question 10

If the pH of a solution increases from 3 to 4, what happens to the $$[\mathrm{H^+}]$$ concentration?

Accepted Answer

It decreases by a factor of 10.

Question 11

A solution has $$[\mathrm{H^+}] = 1.0 	imes 10$$^{-7}$$ M and $$[\mathrm{OH^-}] = 1.0 	imes $$10^{-7} M. $$What is the pH and is the solution acidic, basic, or neutral?

Accepted Answer

pH = 7, neutral

Question 12

Which equation is used to calculate pH from $$[\mathrm{H^+}]$$?

Accepted Answer

$$\mathrm{pH} = -\log([\mathrm{H^+}])$$

Question 13

If a solution has a pH of 12, what is the $$[\mathrm{H^+}]$$ concentration?

Accepted Answer

$$[\mathrm{H^+}] = 1.0 	imes 10$$^{-12}$$ M

Question 14

A solution has $$[\mathrm{H^+}] = 1.0 	imes 10$$^{-10}$$ M. What is the pH and is the solution acidic or basic?

Accepted Answer

pH = 10, basic

Question 15

Which of the following is true about the relationship between pH and $$[\mathrm{H^+}]$$?

Accepted Answer

As $$[\mathrm{H^+}]$$ increases, pH decreases.

Question 16

If a solution has $$[\mathrm{OH^-}] = 1.0 	imes 10$$^{-2}$$ M, what is the $$[\mathrm{H^+}]$$ concentration?

Accepted Answer

$$[\mathrm{H^+}] = \frac{1.0 	imes 10$$^{-14}$$}{1.0 	imes 10$$^{-2}$$} = 1.0 	imes 10$$^{-12}$$ M

Question 17

A solution has a pH of 5.0. What is the $$[\mathrm{OH^-}]$$ concentration?

Accepted Answer

$$[\mathrm{OH^-}] = \frac{1.0 	imes 10$$^{-14}$$}{1.0 	imes 10$$^{-5}$$} = 1.0 	imes 10$$^{-9}$$ M

Question 18

Which of the following is a real-world example of a strong acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl}) in $$stomach acid

Question 19

If a solution has a pH of 2.0, what is the $$[\mathrm{H^+}]$$ concentration?

Accepted Answer

$$[\mathrm{H^+}] = 1.0 	imes 10$$^{-2}$$ M

Intro-to-Chemistry: Acids, Bases, and pH Study Guidance

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