Acids Test

Which of the properties listed below is not characteristic of an acid?

• a. a sour taste

• b. a slippery feel

• c. the ability to conduct an electric current

• d. reactivity with metals

Answer explanation

The correct choice is b. a slippery feel because acids do not have a slippery feel, unlike bases which do.

Which is an example of a weak acid?

• a. HCl

• b. H₂SO₄

• c. H₃SO₄

• d. HNO₃

Answer explanation

The correct choice is c. H₃SO₄ because it is an example of a weak acid compared to the other options which are strong acids.

Acetic acid is found in

• a. vinegar.

• b. the stomach.

• c. antacids.

• d. oranges.

Answer explanation

Acetic acid is found in vinegar, making option a the correct choice.

A characteristic of an Arrhenius base is that it

• a. is an electrolyte.

• b. tastes bitter.

• c. dissociates to form OH⁻ ions.

• d. All of the above

Answer explanation

An Arrhenius base is an electrolyte, tastes bitter, and dissociates to form OH⁻ ions, so the correct answer is d. All of the above.

Which of the following is a Brønsted- Lowry base?

• a. HCl

• b. HCO₃⁻

• c. H₃O⁺

• d. H₃PO₄

Answer explanation

The correct choice is b. HCO₃⁻ because it can accept a proton (H⁺) to form H₂CO₃, making it a Brønsted-Lowry base.

In the reaction represented by the equation H₂C₂O₄(aq) + CH₃NH₂(aq) ⇌ HC₂O₄⁻(aq) + CH₃NH₃⁺(aq), which of these is a conjugate acid-base pair?

• a. H₂C₂O₄(aq) and CH₃NH₂(aq)

• b. H₂C₂O₄(aq) and CH₃NH₃⁺(aq)

• c. CH₃NH₂(aq) and CH₃NH₃⁺(aq)

• d. HC₂O₄⁻(aq) and CH₃NH₃⁺(aq)

Answer explanation

The conjugate acid-base pair in the reaction is CH₃NH₂(aq) and CH₃NH₃⁺(aq) because they only differ by a proton (H⁺).

What is the correct formula for hydrosulfuric acid?

• H₂SO₄

• H₂S

• H₂SO₃

• SO₄²⁻

Answer explanation

The correct formula for hydrosulfuric acid is H₂S, not H₂SO₄, H₂SO₃, or SO₄²⁻.

What is the correct acid name for an aqueous solution of HClO₄?

• hypochlorous acid

• chlorous acid

• chloric acid

• perchloric acid

Answer explanation

The correct acid name for an aqueous solution of HClO₄ is perchloric acid.

A substance that increases the concentration of OH⁻ ions in an aqueous solution is known as a(n)

• Arrhenius acid

• Arrhenius base

• Lewis acid

• Lewis base

Answer explanation

An Arrhenius base is a substance that increases the concentration of OH⁻ ions in an aqueous solution.

An Arrhenius acid in an aqueous solution

• attracts negatively charged anions.

• attracts positively charged cations.

• gives up one or more of its hydrogen ions to water molecules.

• forms ionic bonds with water molecules.

Answer explanation

An Arrhenius acid in an aqueous solution gives up one or more of its hydrogen ions to water molecules, making it an acid.