Strength of Acids and Alkalis

What is the definition of an acid?

• It ionizes in water to form hydrogen ions, H^-.

• It ionizes in water to form hydrogen ions, H⁺.

• It ionizes in water to form hydroxide ions, OH^-.

• It ionizes in water to form hydroxide ions, OH⁺.

Select the statement(s) that is/are true about alkalis.

• Alkalis ionize in water to form hydroxide ions, OH^-.

• Compared to weak alkalis, strong alkalis produce less hydroxide ions when dissolved in water.

• Sodium hydroxide is a strong alkali, whereas calcium hydroxide is a weak alkali.

• The stronger the alkali, the larger its degree of dissociation / ionization to produce ions.

Based on the four given equations, select the strong acids.

• HA (aq)

• H₂B (aq)

• H₂C (aq)

• H₃D (aq)

Tags

NGSS.HS-PS1-2

Calcium hydroxide is a strong alkali. Which equation correctly shows the ionization of calcium hydroxide in water?

• Ca²⁺ (aq) + 2OH^- (aq) --> Ca(OH)₂ (aq)

• Ca(OH)₂ (aq) --> Ca²⁺ (aq) + (OH^-)₂ (aq)

• Ca(OH)₂ (aq) --> Ca²⁺ (aq) + 2OH^- (aq)

• Ca(OH)₂ (aq) --> Ca²⁺ (aq) + 2H⁺ (aq) + 2O^2- (aq)

Tags

NGSS.HS-PS1-2

Select the true statements based on this equation.

• NH₄OH dissolves in water to produce many OH^- ions.

• NH₄OH dissolves in water to produce little OH^- ions.

• NH₄OH is a weak alkali.

• NH₄OH is a weak acid.

Ethanoic acid, CH₃COOH, is a weak acid.

Select the ions that are produced when it dissolves in water.

• H⁺

• CH₃CO⁺

• OH^-

• CH₃COO^-

Tags

NGSS.HS-PS1-7

Hydrochloric acid, HCl is a monobasic acid.

What do you think is the term used to describe sulfuric acid, H₂SO₄?

• monobasic

• dibasic

• tribasic

Select the term(s) that can be used to describe phosphoric acid.

• weak

• strong

• monobasic

• tribasic

Select the terms that you would choose to describe calcium hydroxide, Ca(OH)₂.

• strong alkali

• weak alkali

• monobasic alkali

• dibasic acid

• dibasic alkali