Q: Calculate the $$[OH^-] in a $$solution with $$[H_3O^+] = 2.0 \times 10$$^{-5}$$\ \mathrm{M} at 25$$°C. ($$K_w = 1.0 \times 10$$^{-14}$$)

$$5.0 \times 10$$^{-10}$$\ \mathrm{M}$$

Q: Which of the following statements is true regarding the autoionization of water at 25°C?

The product $$[H_3O^+][OH^-] is $$always $$1.0 \times 10$$^{-14}$$.

Q: Which of the following is the correct formula for calculating percent ionization of a weak acid?

$$\frac{[H_3O^+]_{equil}}{[HA]_{init}} \times 100\%$$

Q: Which of the following is true for the relationship between $$K_a$$ and $$K_b$$ for a conjugate acid–base pair at 25°C?

$$K_a \times K_b = 1.0 \times 10$$^{-14}$$

Question 1

Which of the following best describes the Brønsted–Lowry definition of an acid?

Accepted Answer

A substance that donates an H+ ion to another substance.

Question 2

Which of the following acids is classified as a strong acid?

Accepted Answer

HNO3

Question 3

A solution has $$[H_3O^+] = 1.8 	imes 10$$^{-4}$$\ \mathrm{M}. $$What is its pH?

Accepted Answer

$$3.74$$

Question 4

Which of the following statements about strong acids is correct?

Accepted Answer

Strong acids have weak conjugate bases.

Question 5

Which of the following is the correct expression for the acid ionization constant, $$K_a$$, for the reaction $$HA(aq) + H_2O(l) \rightleftharpoons H_3O^+(aq) + A^-(aq)$$?

Accepted Answer

$$K_a = \frac{[H_3O^+][A^-]}{[HA]}$$

Question 6

A 0.10 M solution of HCl has a pH of:

Accepted Answer

$$1.00$$

Question 7

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

Accepted Answer

NaF

Question 8

Calculate the $$[OH^-] in a $$solution with $$[H_3O^+] = 2.0 	imes 10$$^{-5}$$\ \mathrm{M} at 25$$°C. ($$K_w = 1.0 	imes 10$$^{-14}$$)

Accepted Answer

$$5.0 	imes 10$$^{-10}$$\ \mathrm{M}$$

Question 9

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

Accepted Answer

HF has a stronger H–F bond, making it harder to ionize.

Question 10

Which of the following is an example of a Lewis acid?

Accepted Answer

$$Ag^+$$

Question 11

A solution has a pOH of 3.0 at 25°C. What is its pH?

Accepted Answer

$$11.0$$

Question 12

Which of the following statements is true regarding the autoionization of water at 25°C?

Accepted Answer

The product $$[H_3O^+][OH^-] is $$always $$1.0 	imes 10$$^{-14}$$.

Question 13

Which of the following is the correct formula for calculating percent ionization of a weak acid?

Accepted Answer

$$\frac{[H_3O^+]_{equil}}{[HA]_{init}} 	imes 100\%$$

Question 14

Which of the following best describes an amphoteric substance?

Accepted Answer

A substance that can act as either an acid or a base.

Question 15

Which of the following is true for the relationship between $$K_a$$ and $$K_b$$ for a conjugate acid–base pair at 25°C?

Accepted Answer

$$K_a 	imes K_b = 1.0 	imes 10$$^{-14}$$

Question 16

Which of the following will result in a solution with pH \u003c 7 when dissolved in water?

Accepted Answer

NH4Cl

Question 17

Which of the following trends is correct for the strength of binary acids in the periodic table?

Accepted Answer

Acid strength increases down a group and to the right across a period.

Question 18

A 0.100 M solution of a weak acid, HA, has a pH of 4.25. What is the value of $$K_a$$ for this acid?

Accepted Answer

$$3.1 	imes 10$$^{-8}$$

Question 19

Which of the following is a property of bases?

Accepted Answer

They feel slippery.

Acids and Bases: Definitions, Properties, and Calculations

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