Q: What is the $[\mathrm{H_3O^+}]$ of a solution with a pH of $4.00$?

$1.0 \times 10^{-4}\ \mathrm{M}$

Question 1

Which of the following statements best describes an Arrhenius acid?

Accepted Answer

It produces hydrogen ions $\mathrm{(H^+)}$ when dissolved in water.

Question 2

What is the correct name for the acid with the formula $\mathrm{H_2SO_3}$?

Accepted Answer

Sulfurous acid

Question 3

Which of the following is a characteristic property of bases?

Accepted Answer

They feel soapy and slippery.

Question 4

According to the Brønsted-Lowry theory, which of the following acts as a base in the reaction $\mathrm{NH_3 + H_2O \rightarrow NH_4^+ + OH^-}$?

Accepted Answer

$\mathrm{NH_3}$

Question 5

Which of the following pairs are conjugate acid-base pairs?

Accepted Answer

$\mathrm{HNO_3}$ and $\mathrm{NO_3^-}$

Question 6

Which of the following is a strong acid?

Accepted Answer

Hydrochloric acid ($\mathrm{HCl}$)

Question 7

A solution has a $[\mathrm{OH^-}]$ of $4.87 	imes 10^{-2}\ \mathrm{M}$. What is the classification of this solution?

Accepted Answer

Basic

Question 8

What is the pH of a solution with $[\mathrm{H_3O^+}] = 1.7 	imes 10^{-3}\ \mathrm{M}$?

Accepted Answer

$2.77$

Question 9

Which of the following combinations will create a buffer solution?

Accepted Answer

$\mathrm{H_2CO_3}$ and $\mathrm{NaHCO_3}$

Question 10

If the equilibrium $\mathrm{HF(aq) + H_2O(l) \rightleftharpoons F^-(aq) + H_3O^+(aq)}$ is disturbed by adding more $\mathrm{F^-}$, what will happen according to Le Chatelier's principle?

Accepted Answer

The reaction will shift toward the reactants.

Question 11

Which of the following is the correct net ionic equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

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

Question 12

A buffer solution is prepared by mixing acetic acid and sodium acetate. What happens when a small amount of hydrochloric acid is added to this buffer?

Accepted Answer

The pH remains nearly constant.

Question 13

What is the $[\mathrm{H_3O^+}]$ of a solution with a pH of $4.00$?

Accepted Answer

$1.0 	imes 10^{-4}\ \mathrm{M}$

Question 14

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

Accepted Answer

$\mathrm{2HCl(aq) + CaCO_3(s) \rightarrow CO_2(g) + CaCl_2(aq) + H_2O(l)}$

Question 15

During a titration, $18.5\ \mathrm{mL}$ of $0.215\ \mathrm{M}$ NaOH is required to neutralize $0.0100\ \mathrm{L}$ of HCl. What is the molarity of the HCl solution?

Accepted Answer

$0.398\ \mathrm{M}$

Question 16

Which of the following best explains why antacids are effective in treating heartburn?

Accepted Answer

They neutralize excess stomach acid by reacting with $\mathrm{HCl}$.

Question 17

Which of the following statements about the pH scale is correct?

Accepted Answer

A solution with pH $< 7$ is acidic.

Question 18

If the $[\mathrm{H_3O^+}]$ in a solution is $1.0 	imes 10^{-9}\ \mathrm{M}$, what is the pH of the solution?

Accepted Answer

$9.0$

Question 19

Which of the following is a property of a weak acid?

Accepted Answer

It dissociates only slightly in water.

Acids and Bases and Chemical Equilibrium: Study Notes

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