Q: A solution has $$[H_3O^+] = 2.0 \times 10$$^{-4}$$ \ M. $$What is the pH of this solution?

$$pH = -\log(2.0 \times 10^{-4}) = 3.70$$

Q: A 0.10 M solution of $$HCl is $$prepared. What is the $$[OH^-] in $$this solution at 25°C?

$$[OH^-] = \frac{1.0 \times 10^{-14}}{0.10} = 1.0 \times 10^{-13} \ M$$

Q: What is the pOH of a solution with $$[OH^-] = 4.0 \times 10$$^{-3}$$ \ M$$?

$$pOH = -\log(4.0 \times 10^{-3}) = 2.40$$

Question 1

Which of the following best describes the difference between a strong acid and a weak acid?

Accepted Answer

A strong acid completely ionizes in water, while a weak acid only partially ionizes.

Question 2

Which of the following is the correct expression for the acid ionization constant ($$K_a) $$for acetic acid ($$CH_3COOH) in $$water?

Accepted Answer

$$K_a = \frac{[CH_3COO^-][H_3O^+]}{[CH_3COOH]}$$

Question 3

A solution has $$[H_3O^+] = 2.0 	imes 10$$^{-4}$$ \ M. $$What is the pH of this solution?

Accepted Answer

$$pH = -\log(2.0 	imes 10^{-4}) = 3.70$$

Question 4

Which of the following acids is triprotic?

Accepted Answer

Phosphoric acid ($$H_3PO_4)$$

Question 5

Which of the following salts will produce a basic solution when dissolved in water?

Accepted Answer

Sodium acetate ($$NaCH_3COO)$$

Question 6

What is the conjugate base of $$HCO_3$$^-$$?

Accepted Answer

$$CO_3^{2-}$$

Question 7

Which of the following statements about water is correct?

Accepted Answer

Water is amphoteric, meaning it can act as both an acid and a base.

Question 8

A 0.10 M solution of $$HCl is $$prepared. What is the $$[OH^-] in $$this solution at 25°C?

Accepted Answer

$$[OH^-] = \frac{1.0 	imes 10^{-14}}{0.10} = 1.0 	imes 10^{-13} \ M$$

Question 9

Which of the following is a weak base commonly used in household cleaning products?

Accepted Answer

Ammonia ($$NH_3)$$

Question 10

Which of the following best explains why $$HF is a $$weak acid while $$HCl is a $$strong acid?

Accepted Answer

The bond between H and F in $$HF is $$much stronger than the bond between H and Cl in $$HCl$$, making it harder for $$HF to $$ionize.

Question 11

A student mixes equal concentrations of $$HCl ($$strong acid) and $$CH_3COOH ($$weak acid). Which statement is correct about the resulting $$[H_3O^+]$$?

Accepted Answer

The $$[H_3O^+]$$ will be determined almost entirely by the $$HCl.$$

Question 12

Which of the following is the correct relationship between $$K_a$$, $$K_b$$, and $$K_w$$ for a conjugate acid-base pair?

Accepted Answer

$$K_a 	imes K_b = K_w$$

Question 13

Which of the following substances is most likely to have a pH greater than 7?

Accepted Answer

Household ammonia

Question 14

What is the pOH of a solution with $$[OH^-] = 4.0 	imes 10$$^{-3}$$ \ M$$?

Accepted Answer

$$pOH = -\log(4.0 	imes 10^{-3}) = 2.40$$

Question 15

Which of the following is the conjugate acid of $$SO_4$$^{2-}$$?

Accepted Answer

$$HSO_4^-$$

Question 16

A solution is prepared by dissolving $$NH_4Cl in $$water. What is the expected pH of the solution?

Accepted Answer

Less than 7 (acidic)

Question 17

Which of the following best describes the effect of temperature on $$K_w ($$the ion product of water)?

Accepted Answer

$$K_w$$ increases as temperature increases.

Question 18

Which of the following is a real-world application of sulfuric acid ($$H_2SO_4$$)?

Accepted Answer

Fertilizer and explosives manufacturing

Question 19

Which of the following statements is true about polyprotic acids?

Accepted Answer

Each ionization step has a separate $$K_a$$, and $$K_{a1} \u003e K_{a2} \u003e K_{a3}.$$

Acids, Bases, and Their Properties: General Chemistry Study Notes

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