Acid-Base Chemistry Quiz

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Questions and Answers

What is the concentration of H3O+ ions in a solution where the concentration of OH- ions is 1.0 × 10^-10 M at 25°C?

1.0 × 10^4 M
1.0 × 10^-4 M (correct)
1.0 × 10^-14 M
1.0 × 10^-10 M

What is the pH of a solution with a hydroxide ion concentration of 1.0 × 10^-12 M?

2
14
12 (correct)
10

Which of the following statements correctly describes the self-ionization of water?

Water molecules react with each other to form hydronium and hydroxide ions. (correct)
Water molecules react with dissolved ions to form hydronium and hydroxide ions.
Water molecules react with dissolved gases to form hydronium and hydroxide ions.
Water molecules react with dissolved solids to form hydronium and hydroxide ions.

What does the term 'amphiprotic' mean in the context of water?

Water can act as both an acid and a base. (B) Signup and view all the answers

What is the relationship between the concentration of hydronium ions ([H3O+]) and hydroxide ions ([OH-]) in a basic solution?

[OH-] > [H3O+] (C), [H3O+] < [OH-] (D) Signup and view all the answers

If a solution has a hydronium ion concentration of 1.0 x 10^-9 M at 25°C, what is the hydroxide ion concentration?

1.0 x 10^-9 M (A) Signup and view all the answers

Which of the following correctly describes the auto-ionization of liquid ammonia?

2NH3  NH4+ + NH2- (D) Signup and view all the answers

A solution has a hydroxide ion concentration of 1.0 x 10^-12 M. What is the pH of this solution?

12 (D) Signup and view all the answers

What is the strongest acid that can exist in liquid ammonia?

NH4+ (D) Signup and view all the answers

What is the Kc expression for the auto-ionization of ammonia?

Kc = [NH4+][NH2-]/[NH3]^2 (C) Signup and view all the answers

If a solution in liquid ammonia has a [NH2-] concentration greater than [NH4+] concentration, the solution is considered to be:

basic (C) Signup and view all the answers

What is the concentration of OH- in a solution at 25°C with a hydronium ion concentration of 5.0 x 10^-3 M?

2.0 x 10^-11 M (C) Signup and view all the answers

What is the pOH of a solution with an OH- ion concentration of 1.0 x 10^-10 M?

10 (D) Signup and view all the answers

What is the pH of a solution with a pOH of 11.5?

2.5 (A) Signup and view all the answers

What is the H3O+ ion concentration of a solution with a pH of 3.2?

6.3 x 10^-11 M (B) Signup and view all the answers

What is the OH- ion concentration of a solution with a pOH of 9.0?

1.0 x 10^-9 M (D) Signup and view all the answers

A solution of a strong acid has a pH of 1.0. What is the pOH of this solution?

13.0 (A) Signup and view all the answers

What is the pH of a 0.010 M solution of HCl?

2.0 (A) Signup and view all the answers

If the pH of a solution is 4.5, what is the [OH-] in the solution?

3.2 x 10^-10 M (C) Signup and view all the answers

A solution has an H3O+ concentration of 1.0 x 10^-8 M. What is the pOH of this solution?

6.0 (A) Signup and view all the answers

Which of the following acids would have the highest concentration of hydronium ions (H3O+) in a solution of the same concentration?

Hydrochloric acid (HCl) (D) Signup and view all the answers

What is the relationship between the strength of an acid and its pH value?

Stronger acids have lower pH values. (C) Signup and view all the answers

A solution has a pH of 10 at 25°C. Is the solution acidic, basic, or neutral?

Basic (D) Signup and view all the answers

Which of the following statements is TRUE about weak acids?

Weak acids only partially dissociate in water. (A) Signup and view all the answers

Why is the net direction of an acid-base reaction driven towards the formation of a weaker acid and a weaker base?

The reaction seeks to achieve equilibrium by favoring the formation of the most stable products. (A) Signup and view all the answers

What is the general relationship between the strength of a base and its pOH value?

Stronger bases have lower pOH values. (B) Signup and view all the answers

Which of the following is NOT a strong acid?

Carbonic acid (H2CO3) (A) Signup and view all the answers

What is the relationship between the strength of an acid and the extent of its ionization in water?

Stronger acids ionize to a greater extent. (D) Signup and view all the answers

Which of the following expressions correctly represents the base dissociation constant (Kb) for a weak base, B, in water?

Kb = [HB+][OH-] / [B] (B) Signup and view all the answers

Given the following base ionization reaction: B(aq) + H2O(l) ⇌ HB+(aq) + OH-(aq), what is the relationship between the concentration of the base (B) and the concentration of its conjugate acid (HB+)?

The relationship between the concentrations depends on the specific base and its Kb value. (C) Signup and view all the answers

Which of the following weak bases would have the highest pH in a 0.1 M solution?

Ethylamine (C2H5NH2) - Kb = 4.7 × 10^-4 (D) Signup and view all the answers

What happens to the pH of a solution as the Kb of a weak base increases?

The pH increases. (B) Signup and view all the answers

How does the Kb value of a weak base relate to the strength of its conjugate acid?

A smaller Kb value corresponds to a stronger conjugate acid. (C) Signup and view all the answers

In solving problems involving weak bases, what is the key difference in approach compared to solving problems involving weak acids?

We calculate the concentration of OH- ions first, instead of H+ ions. (C) Signup and view all the answers

What is true of a solution containing a weak base and its conjugate acid?

The solution can be acidic, basic, or neutral depending on the relative concentrations of the base and its conjugate acid. (A) Signup and view all the answers

Which of the following is NOT a common weak base?

Hydrochloric acid (HCl) (D) Signup and view all the answers

Which of the following is NOT a characteristic of water as a solvent?

Water is a very strong electrolyte. (C) Signup and view all the answers

What does the term "autoionization of water" refer to?

The process where water molecules react with each other to form hydronium and hydroxide ions. (C) Signup and view all the answers

Which of the following molecules or ions is NOT an amphiprotic species?

HF (D) Signup and view all the answers

In the reaction of NH3 with water, water acts as a(n):

Acid (D) Signup and view all the answers

Which of the following statements accurately describes the role of water in the reaction with CH3COOH?

Water acts as a base, accepting a proton from CH3COOH. (C) Signup and view all the answers

How does the ability of water to act as both an acid and a base contribute to its effectiveness as a solvent?

It enables water to dissolve a wide range of substances, both polar and nonpolar. (A) Signup and view all the answers

Which of the following statements best describes the role of water in the autoionization reaction?

Water acts as a reactant, donating and accepting protons. (D) Signup and view all the answers

Which of the following examples demonstrates water acting as a base?

The reaction of water with HCl to form H3O+ and Cl-. (B), The reaction of water with itself to form H3O+ and OH-. (C) Signup and view all the answers

Flashcards

Ionization of Water

The process where water molecules self-ionize to form H3O+ and OH- ions.

Kw

The ion product of water, equal to [H3O+][OH-] at 25°C.