$$[H^+] \approx 1.7 \times 10$$^{-4}$$ M

Question 1

Which of the following best describes an Arrhenius acid?

Accepted Answer

A substance that increases the concentration of hydrogen ions ($$H^+) in $$water.

Question 2

What is the correct balanced equation for the dissociation of sulfuric acid ($$H_2SO_4) in $$water?

Accepted Answer

$$H_2SO_4 \rightarrow 2H^+ + SO_4$^{2-}$$

Question 3

A solution has $$[H^+] = 1.0 	imes 10$$^{-3}$$ M. What is its pH?

Accepted Answer

$$pH = 3$$

Question 4

Which of the following is a property of bases?

Accepted Answer

They feel slippery and turn litmus paper blue.

Question 5

What is the molecular formula for calcium hydroxide?

Accepted Answer

$$Ca(OH)_2$$

Question 6

Which equation represents the autoionization of water?

Accepted Answer

$$H_2O + H_2O \rightarrow H_3O^+ + OH^-$$

Question 7

If a solution has $$[OH^-] = 1.0 	imes 10$$^{-5}$$ M, what is its pOH and pH?

Accepted Answer

$$pOH = 5$$, $$pH = 9$$

Question 8

Which of the following statements about strong acids is TRUE?

Accepted Answer

Strong acids fully dissociate in water.

Question 9

A buffer solution is important in biological systems because:

Accepted Answer

It prevents large changes in pH when acids or bases are added.

Question 10

What is the pH of a solution with $$[H^+] = 4.7 	imes 10$$^{-3}$$ M?

Accepted Answer

$$pH = 2.33$$

Question 11

Which of the following is a weak acid?

Accepted Answer

Acetic acid ($$CH_3COOH)$$

Question 12

What happens to the pH of a solution when the concentration of hydrogen ions increases?

Accepted Answer

The pH decreases.

Question 13

Which of the following best describes a Brønsted–Lowry base?

Accepted Answer

A substance that accepts a proton ($$H^+).$$

Question 14

A titration curve shows a sharp increase in pH at the equivalence point. What does this indicate?

Accepted Answer

A strong acid is being titrated with a strong base.

Question 15

Which equation correctly relates pH and pOH?

Accepted Answer

$$pH + pOH = 14$$

Question 16

If $$K_a = 2.2 	imes 10$$^{-6}$$ and the initial acid concentration is 0.135$ M, what is the $$[H^+]$$ for a weak monoprotic acid?

Accepted Answer

$$[H^+] \approx 1.7 	imes 10$$^{-4}$$ M

Question 17

Which of the following is a strong base?

Accepted Answer

Potassium hydroxide ($$KOH)$$

Question 18

A hydrangea plant changes flower color due to:

Accepted Answer

The acidity or basicity of the soil.

Question 19

What is the product of the reaction: $$HCl + Fe(OH)_3 \rightarrow$$ ?

Accepted Answer

$$FeCl_3 + 3H_2O$

Question 20

Which of the following statements about buffers is TRUE?

Accepted Answer

A buffer resists changes in pH when small amounts of acid or base are added.

Acids, Bases, pH, and Titration Study Guide for GOB College Chemistry

스터디 가이드 - 연습 문제