Question 1

The conjugate base of HCO₃^- is: A)H₂CO₃ B)HCO₂⁻ C)CO₃²⁻ D)CO₂ E)H₃CO₃⁺

Accepted Answer

The conjugate base is formed by removing a proton from the original compound. In this case, the proton that could be removed is from the hydrogen attached to the sulfur atom with a negative charge. This would result in CO₃ losing the proton and becoming CO₃²⁻. Therefore, the correct choice is C.

Question 2

When acetate ion, CH₃CO₂⁻, reacts with water, what are the products? A)H⁺(aq)and OH⁻(aq) B)CH₃CO₂⁺(aq)and OH⁻(aq) C)CH₃CO₂⁺(aq)and H₂O(aq) D)CH₃CO₂⁺(aq)and H⁻(aq) E)CH₃CO₂H(aq)and OH⁻(aq)

Accepted Answer

When acetate ion reacts with water, it acts as a base, accepting a proton (H+) from water to form acetic acid (CH3COOH) and hydroxide ion (OH−).

Question 3

Select the two Brønsted-Lowry bases in the following equation: CH₃NH₂(aq)+ H₂O(l)⇌ CH₃NH₃⁺(aq)+ OH⁻(aq) A)CH₃NH₂ and H₂O B)CH₃NH₂and OH⁻ C)H₂O and OH⁻ D)CH₃NH₂ and CH₃NH₃⁺ E)CH₃NH₃⁺ and OH⁻

Accepted Answer

A Brønsted-Lowry base is a species that accepts a proton (H+). In the given equation, CH₃NH₂ and OH⁻ are the two species that accept a proton, making them the Brønsted-Lowry bases.

Question 4

When ammonia, NH₃, is dissolved in water, which ions are formed? A)NH₃⁻(aq)and OH⁻(aq) B)NH₃⁺(aq)and OH⁻(aq) C)NH₄⁺(aq)and OH⁻(aq) D)NH₄⁺(aq)and H⁻(aq) E)NH₂⁻(aq)and H⁺(aq)

Accepted Answer

When ammonia is dissolved in water, it acts as a weak base and accepts a proton from water, forming NH₄⁺ and OH⁻ ions.

Question 5

Select the pair that consists of a base and its conjugate acid in that order. A)NH₃/NH₄⁺ B)HCO₃⁻/CO₃²⁻ C)H₂CO₃/HCO₃⁻ D)H₃PO₄/ HPO₄²⁻ E)CO₃²⁻/CO₂²⁻

Accepted Answer

NH₃ is a base and NH₄⁺ is its conjugate acid, as NH₃ can accept a proton to form NH₄⁺.

Question 6

The conjugate acid of HCO₃⁻ is: A)H₂CO₃ B)HCO₂⁻ C)CO₃²⁻ D)CO₂ E)H₃CO₃⁺

Accepted Answer

The conjugate acid of a base is formed by adding a proton (H+) to the base. Therefore, the conjugate acid of HCOS^- will be H2COS, which corresponds to choice A when considering the formatting provided.

Question 7

Select the two Brønsted-Lowry bases in the following equation: CO₃²⁻(aq)+ H₂O(l)⇌ HCO₃⁻(aq)+ OH⁻(aq) A)CO₃²⁻ and H₂O B)CO₃²⁻ and HCO₃⁻ C)H₂O and OH⁻ D)CO₃²⁻ and OH⁻ E)H₂O and HCO₃⁻

Accepted Answer

Brønsted-Lowry bases are substances that can accept a proton (H+). In the given equation, $ \text{CO}_3^{2-} $ and $ \text{OH}^- $ are the two species that can accept a proton, forming $ \text{HCO}_3^- $ and water ($ \text{H}_2\text{O} $), respectively.

Question 8

The conjugate base of H₂PO₄⁻ is: A)HPO₄²⁻ B)H₂PO₃⁻ C)H₃PO₄ D)PO₄³⁻ E)H₂PO₄OH⁻

Accepted Answer

The conjugate base of an acid is formed by removing one proton (H⁺) from the acid. Removing a proton from H₂PO₄⁻ results in HPO₄²⁻.

Question 9

The conjugate acid of H₂PO₄⁻ is: A)HPO₄²⁻ B)H₂PO₃⁻ C)H₃PO₄ D)PO₄³⁻ E)H₃PO₃

Accepted Answer

The answer of The conjugate acid of H₂PO₄⁻ is: A)HPO₄²⁻ B)H₂PO₃⁻ C)H₃PO₄ D)PO₄³⁻ E)H₃PO₃...

Question 10

Select the two Brønsted-Lowry bases in the following equation: NH₃(aq)+ H₂O(aq)⇌ NH₄⁺(aq)+ OH⁻(aq) A)NH₃and H₂O B)NH₃ and OH⁻ C)H₂O and OH⁻ D)NH₃ and NH₄⁺ E)NH₄⁺ and OH⁻

Accepted Answer

In the equation, the Brønsted-Lowry base is defined as a molecule or ion that can accept a proton (H+). The two bases in this equation are OHS1U1P1−S1S1P0, which can accept a proton to form HS1U1B0S1U1P1−S1S1P0, and NHS1U1B13S1U1B0, which can accept a proton to form NHS1U1B14S1U1B0S1U1P1+S1S1P0. Therefore, option B is the best choice because it correctly identifies both bases.

Question 11

Select the pair that consists of a base and its conjugate acid in that order. A)NH₄⁺/NH₃ B)HCO₃⁻/CO₃²⁻ C)HCO₃⁻/H₂CO₃ D)H₃PO₄/ HPO₄²⁻ E)CO₃²⁻/CO₂²⁻

Accepted Answer

In the given options, only option C has a base (H₂) and its conjugate acid (HCO₃⁻) in the correct order. The conjugate acid is formed when one proton (H+) is added to the base.

Question 12

Select the pair that consists of an acid and its conjugate base in that order. A)NH₃/NH₄⁺ B)CO₃²⁻/HCO₃⁻ C)H₂CO₃/HCO₃⁻ D)HPO₄²⁻/H₃PO₄ E)CO₃^2-/ CO₂^2-

Accepted Answer

H₂CO₃ is an acid, and HCO₃⁻ is its conjugate base after losing a proton.

Question 13

Select the pair that consists of an acid and its conjugate base in that order. A)NH₄⁺/NH₂^- B)CO₃²⁻/HCO₃⁻ C)CO₃²⁻/H₂CO₃⁻ D)H₂PO₄-/H₃PO₄ E)H₂CO₃/HCO₃⁻

Accepted Answer

H₂CO₃ is the acid and HCO₃⁻ is its conjugate base, formed by the loss of a proton (H⁺).

Question 14

Which of the following is an amphoteric substance? A)NaCl B)LiOH C)KBr D)NaHCO₃ E)CH₃OH

Accepted Answer

NaHCO₃ (sodium bicarbonate) is amphoteric because it can act as both an acid and a base.

Question 15

Select the two Brønsted-Lowry acids in the following equation: CO₃^2-(aq)+ HF(aq)⇌ HCO₃^-(aq)+ F^-(aq) A)CO₃^2- and HF B)CO₃^2- and HCO₃^- C)HF and F^- D)CO₃^2- and F^- E)HF and HCO₃^-

Accepted Answer

HF donates a proton to become F⁻, and HCO₃⁻ can donate a proton to become CO₃²⁻, making them both Brønsted-Lowry acids.

Question 16

Select the pair that consists of an acid and its conjugate base in that order. A)NH₃/NH₄⁺ B)SO₄²⁻/HSO₃⁻ C)H₂SO₃/HSO₃⁻ D)H₂PO₄⁻/H₃PO₄ E)CO₃²⁻/HCO₃²⁻

Accepted Answer

In this pair, H₂ is the acid and its conjugate base is HSO₃. This is because the acid donates a proton to form the conjugate base.

Question 17

Select the two Brønsted-Lowry acids in the following equation: NH₃(aq)+ HF(aq)⇌ NH₄⁺(aq)+ F⁻(aq) A)NH₃ and HF B)NH₃ and F⁻ C)HF and F⁻ D)NH₄⁺ and F^- E)HF and NH₄⁺

Accepted Answer

HF donates a proton to NH3, forming NH4+, and NH4+ can donate a proton back to F-, making HF and NH4+ the Brønsted-Lowry acids.

Question 18

When carbonate ion, CO₃²⁻, reacts with water, what are the products? A)H⁺(aq)and OH⁻(aq) B)HCO₃(aq)and OH⁻(aq) C)HCO₃⁺(aq)and H₂O(aq) D)HCO₃⁻(aq)and H⁻(aq) E)HCO₃⁻(aq)and OH⁻(aq)

Accepted Answer

When carbonate ion reacts with water, it forms bicarbonate ion (HCO3-) and hydroxide ion (OH-), which corresponds to choice E.

Question 19

When fluoride ion, F⁻, reacts with water, what are the products? A)H⁺(aq)and OH⁻(aq) B)F⁺(aq)and OH⁻(aq) C)F⁺(aq)and H₂O(aq) D)HF(aq)and H⁻(aq) E)HF(aq)and OH⁻(aq)

Accepted Answer

When fluoride ion reacts with water, it acts as a base and picks up a proton (H+) from water to form HF (hydrofluoric acid) and hydroxide ion (OH-). The products are HF(aq) and OH⁻(aq), which corresponds to choice E.

Question 20

When sodium hydroxide, NaOH, is dissolved in water, which species are present in addition to water? A)NaOH(aq) B)Na⁺(aq)and OH⁻(aq) C)Na⁺(aq)and H₃O⁻(aq) D)Na⁺(aq)and O₂H₂²⁻(aq) E)NaO⁻(aq)and H₃O⁺(aq)

Accepted Answer

When sodium hydroxide, NaOH, is dissolved in water, the species present in addition to water are the cation Na+ and the anion OH-. Therefore, choice B is the best option as it includes both Na+ and OH-. Choices C, D, and E include additional species that are not present when NaOH is dissolved in water. Choice A only includes NaOH and does not include the separate Na+ and OH- ions.

Quiz 13: Acids and Bases

The conjugate base of HCO₃^- is:

When acetate ion, CH₃CO₂⁻, reacts with water, what are the products?

Select the two Brønsted-Lowry bases in the following equation: CH₃NH₂(aq) + H₂O(l) ⇌ CH₃NH₃⁺(aq) + OH⁻(aq)

When ammonia, NH₃, is dissolved in water, which ions are formed?

Select the pair that consists of a base and its conjugate acid in that order.

The conjugate acid of HCO₃⁻ is:

Select the two Brønsted-Lowry bases in the following equation: CO₃²⁻(aq) + H₂O(l) ⇌ HCO₃⁻(aq) + OH⁻(aq)

The conjugate base of H₂PO₄⁻ is:

The conjugate acid of H₂PO₄⁻ is:

Select the two Brønsted-Lowry bases in the following equation: NH₃(aq) + H₂O(aq) ⇌ NH₄⁺(aq) + OH⁻(aq)

Select the pair that consists of a base and its conjugate acid in that order.

Select the pair that consists of an acid and its conjugate base in that order.

Select the pair that consists of an acid and its conjugate base in that order.

Which of the following is an amphoteric substance?

Select the two Brønsted-Lowry acids in the following equation: CO₃^2-(aq) + HF(aq) ⇌ HCO₃^-(aq) + F^-(aq)

Select the pair that consists of an acid and its conjugate base in that order.

Select the two Brønsted-Lowry acids in the following equation: NH₃(aq) + HF(aq) ⇌ NH₄⁺(aq) + F⁻(aq)

When carbonate ion, CO₃²⁻, reacts with water, what are the products?

When fluoride ion, F⁻, reacts with water, what are the products?

When sodium hydroxide, NaOH, is dissolved in water, which species are present in addition to water?

Quiz 13: Acids and Bases

The conjugate base of HCO3- is:

When acetate ion, CH3CO2−, reacts with water, what are the products?

Select the two Brønsted-Lowry bases in the following equation: CH3NH2(aq) + H2O(l) ⇌ CH3NH3+(aq) + OH−(aq)

When ammonia, NH3, is dissolved in water, which ions are formed?

Select the pair that consists of a base and its conjugate acid in that order.

The conjugate acid of HCO3− is:

Select the two Brønsted-Lowry bases in the following equation: CO32−(aq) + H2O(l) ⇌ HCO3−(aq) + OH−(aq)

The conjugate base of H2PO4− is:

The conjugate acid of H2PO4− is:

Select the two Brønsted-Lowry bases in the following equation: NH3(aq) + H2O(aq) ⇌ NH4+(aq) + OH−(aq)

Select the pair that consists of a base and its conjugate acid in that order.

Select the pair that consists of an acid and its conjugate base in that order.

Select the pair that consists of an acid and its conjugate base in that order.

Which of the following is an amphoteric substance?

Select the two Brønsted-Lowry acids in the following equation: CO32-(aq) + HF(aq) ⇌ HCO3-(aq) + F-(aq)

Select the pair that consists of an acid and its conjugate base in that order.

Select the two Brønsted-Lowry acids in the following equation: NH3(aq) + HF(aq) ⇌ NH4+(aq) + F−(aq)

When carbonate ion, CO32−, reacts with water, what are the products?

When fluoride ion, F−, reacts with water, what are the products?

When sodium hydroxide, NaOH, is dissolved in water, which species are present in addition to water?

The conjugate base of HCO₃^- is:

When acetate ion, CH₃CO₂⁻, reacts with water, what are the products?

Select the two Brønsted-Lowry bases in the following equation: CH₃NH₂(aq) + H₂O(l) ⇌ CH₃NH₃⁺(aq) + OH⁻(aq)

When ammonia, NH₃, is dissolved in water, which ions are formed?

The conjugate acid of HCO₃⁻ is:

Select the two Brønsted-Lowry bases in the following equation: CO₃²⁻(aq) + H₂O(l) ⇌ HCO₃⁻(aq) + OH⁻(aq)

The conjugate base of H₂PO₄⁻ is:

The conjugate acid of H₂PO₄⁻ is:

Select the two Brønsted-Lowry bases in the following equation: NH₃(aq) + H₂O(aq) ⇌ NH₄⁺(aq) + OH⁻(aq)

Select the two Brønsted-Lowry acids in the following equation: CO₃^2-(aq) + HF(aq) ⇌ HCO₃^-(aq) + F^-(aq)

Select the two Brønsted-Lowry acids in the following equation: NH₃(aq) + HF(aq) ⇌ NH₄⁺(aq) + F⁻(aq)

When carbonate ion, CO₃²⁻, reacts with water, what are the products?

When fluoride ion, F⁻, reacts with water, what are the products?