Q: A solution has a $$[\mathrm{H_3O^+}] of$$ $$1.0 \times 10$$^{-6}$$ M. What is its pH?

$$pH = -\log(1.0 \times 10$$^{-6}$$) = 6$$

Question 1

Which of the following statements best describes a strong acid in aqueous solution, based on the provided materials?

Accepted Answer

It ionizes completely, resulting in 100% dissociation into ions.

Question 2

Given the reaction $$\mathrm{HA + H_2O \rightarrow A^- + H_3O^+}$$, which of the following would you expect to see in a graph representing a strong acid?

Accepted Answer

Low concentration of HA and high concentrations of $$\mathrm{A^-}$$ and $$\mathrm{H_3O^+}.$$

Question 3

Which of the following acids is classified as a weak acid according to the study materials?

Accepted Answer

HC_2H_3O_2

Question 4

A solution has a $$[\mathrm{H_3O^+}] of$$ $$1.0 	imes 10$$^{-6}$$ M. What is its pH?

Accepted Answer

$$pH = -\log(1.0 	imes 10$$^{-6}$$) = 6$$

Question 5

If a solution has a pH of 8, what is the concentration of hydroxide ions $$[\mathrm{OH^-}]$$?

Accepted Answer

$$[\mathrm{OH^-}] = 10$$^{-6}$$ M

Question 6

Which of the following bases is classified as a strong base according to the study materials?

Accepted Answer

NaOH

Question 7

A student sketches a diagram showing mostly $$\mathrm{A^-}$$ and $$\mathrm{H_3O^+}$$ ions, with very little HA present. What does this diagram represent?

Accepted Answer

A strong acid in water

Question 8

Which equation correctly relates pH and pOH in aqueous solution?

Accepted Answer

$$pH + pOH = 14$$

Question 9

A solution of $$\mathrm{BOH} in $$water shows a low concentration of $$\mathrm{BOH}$$ and high concentrations of $$\mathrm{OH^-}$$ and $$\mathrm{B^+}. $$What does this indicate about $$\mathrm{BOH}$$?

Accepted Answer

BOH is a strong base

Question 10

If the pOH of a solution is 3, what is the concentration of hydroxide ions $$[\mathrm{OH^-}]$$?

Accepted Answer

$$[\mathrm{OH^-}] = 10$$^{-3}$$ M

Question 11

Which of the following statements is true about chemical indicators and pH?

Accepted Answer

Chemical indicators change color depending on the pH of the solution.

Question 12

A solution contains $$0.01 M$$ $$[\mathrm{H_3O^+}]. $$What is its pH and is it acidic or basic?

Accepted Answer

$$pH = 2$$, acidic

Question 13

Which of the following is a characteristic of a weak base in aqueous solution?

Accepted Answer

It releases only a few hydroxide ions.

Question 14

If a solution has a pH of 5, what is its $$[\mathrm{H_3O^+}]$$?

Accepted Answer

$$[\mathrm{H_3O^+}] = 10$$^{-5}$$ M

Question 15

Which of the following is NOT a strong acid according to the study materials?

Accepted Answer

H_2CO_3

Question 16

A student is asked to sketch a graph for a weak acid. Which feature should the graph show?

Accepted Answer

High concentration of HA, low concentrations of $$\mathrm{A^-}$$ and $$\mathrm{H_3O^+}$$

Question 17

Which of the following is a weak base according to the study materials?

Accepted Answer

$$NH_3$$

Question 18

A solution has a pH of 12. What is its pOH?

Accepted Answer

$$pOH = 2$$

Question 19

Which of the following best explains why strong acids and bases are strong electrolytes?

Accepted Answer

They ionize completely in water, producing a large number of ions.

Question 20

A patient’s blood has a pH of 7.2. Is this considered acidic, basic, or neutral?

Accepted Answer

Acidic

Acids, Bases, and pH: Strength, Ionization, and Quantitative Analysis

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