$$5.0 \times 10$$^{-12}$$\ \mathrm{M}$$

$$1.0 \times 10$$^{-3}$$\ \mathrm{M}$$

$$K_w = [\mathrm{H_3O^+}] \times [\mathrm{OH^-}]$$

Question 1

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

Accepted Answer

A substance that donates H+ ions

Question 2

What is the correct name for HNO2?

Accepted Answer

Nitrous acid

Question 3

Which of the following equations represents the dissociation of a strong acid in water?

Accepted Answer

$$\mathrm{HCl}(g) + \mathrm{H_2O}(l) \rightarrow \mathrm{H_3O^+}(aq) + \mathrm{Cl^-}(aq)$$

Question 4

A solution has $$[\mathrm{H_3O^+}] = 2.0 	imes 10$$^{-3}$$\ \mathrm{M}. $$What is $$[\mathrm{OH^-}] at 25$$°C?

Accepted Answer

$$5.0 	imes 10$$^{-12}$$\ \mathrm{M}$$

Question 5

Which of the following combinations will create a buffer solution?

Accepted Answer

H2CO3 and NaHCO3

Question 6

What is the pH of a solution with $$[\mathrm{H_3O^+}] = 4.0 	imes 10$$^{-5}$$\ \mathrm{M}$$?

Accepted Answer

4.40

Question 7

Which of the following is a characteristic of a base?

Accepted Answer

Feels soapy and slippery

Question 8

Which of the following is the correct net ionic equation for the neutralization of a strong acid with a strong base?

Accepted Answer

$$\mathrm{H^+}(aq) + \mathrm{OH^-}(aq) \rightarrow \mathrm{H_2O}(l)$$

Question 9

A buffer solution is prepared using acetic acid and sodium acetate. What happens when a small amount of HCl is added?

Accepted Answer

The acetate ion neutralizes the added HCl, and the pH changes only slightly

Question 10

Which of the following is the conjugate base of H2CO3?

Accepted Answer

$$HCO3^{-}$$

Question 11

If the pH of a solution is 3.0, what is the $$[\mathrm{H_3O^+}]$$?

Accepted Answer

$$1.0 	imes 10$$^{-3}$$\ \mathrm{M}$$

Question 12

Which of the following best describes what happens to the equilibrium when more reactant is added to a system at equilibrium?

Accepted Answer

The system shifts toward the products

Question 13

Which of the following is a strong base?

Accepted Answer

NaOH

Question 14

A laboratory technician titrates 0.0250 L of HCl with 25.5 mL of 0.438 M NaOH. What is the molarity of the HCl solution?

Accepted Answer

0.447 M

Question 15

Which of the following reactions represents the reaction of an acid with a carbonate?

Accepted Answer

$$\mathrm{HCl}(aq) + \mathrm{$$NaHCO_3$$}(s) \rightarrow \mathrm{CO_2$}(g) + \mathrm{NaCl}(aq) + \mathrm{H_2O}(l)$$

Question 16

Which of the following best describes a buffer solution?

Accepted Answer

A solution that maintains its pH when small amounts of acid or base are added

Question 17

Which of the following is the correct formula for the ion product constant for water ($$K_w) at 25$$°C?

Accepted Answer

$$K_w = [\mathrm{H_3O^+}] 	imes [\mathrm{OH^-}]$$

Question 18

Which of the following is the conjugate acid of NH3?

Accepted Answer

NH4+

Acids, Bases, and Equilibrium: Study Guide for College Chemistry

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