Arrhenius Acids & Bases

What is the Arrhenius definition of acids?

• Substances that dissociate in water to produce hydrogen ions (H+)

• Substances that produce oxygen gas when dissolved in water

• Substances that release hydroxide ions (OH-)

• Substances that do not react with water

Answer explanation

The Arrhenius definition of acids states that they are substances that dissociate in water to produce hydrogen ions (H+), making the correct choice 'Substances that dissociate in water to produce hydrogen ions (H+)'

What are the properties of Arrhenius acids?

• Decrease H+ concentration in water

• Sweet taste

• Increase H+ concentration in water, sour taste, turn blue litmus paper red, react with metals to produce hydrogen gas

• Turn red litmus paper blue

Answer explanation

Arrhenius acids increase H+ concentration in water, have a sour taste, turn blue litmus paper red, and react with metals to produce hydrogen gas.

Give an example of an Arrhenius acid.

• acetic acid (CH3COOH)

• sulfuric acid (H2SO4)

• nitric acid (HNO3)

• hydrochloric acid (HCl)

Answer explanation

The correct example of an Arrhenius acid is hydrochloric acid (HCl). It dissociates in water to produce H+ ions.

What are the properties of Arrhenius bases?

• Arrhenius bases have a sour taste

• Arrhenius bases dissociate in water to release hydroxide ions (OH-), have a bitter taste, a slippery feel, and turn red litmus paper blue.

• Arrhenius bases turn blue litmus paper red

• Arrhenius bases do not dissociate in water

Answer explanation

Arrhenius bases dissociate in water to release hydroxide ions (OH-), have a bitter taste, a slippery feel, and turn red litmus paper blue.

Give an example of an Arrhenius base.

• Hydrochloric acid (HCl)

• Sodium hydroxide (NaOH)

• Ammonium hydroxide (NH4OH)

• Potassium hydroxide (KOH)

Answer explanation

Sodium hydroxide (NaOH) is an example of an Arrhenius base as it dissociates in water to produce hydroxide ions (OH-) which are responsible for the basic properties.

How do Arrhenius acids and bases differ in terms of hydrogen ion (H+) and hydroxide ion (OH-) production?

• Arrhenius bases produce H+ ions, and Arrhenius acids produce OH- ions.

• Arrhenius acids produce both H+ and OH- ions simultaneously.

• Arrhenius acids produce OH- ions, and Arrhenius bases produce H+ ions.

• Arrhenius acids produce H+ ions, and Arrhenius bases produce OH- ions.

Answer explanation

Arrhenius acids produce H+ ions, and Arrhenius bases produce OH- ions. This is because acids release H+ ions in solution, while bases release OH- ions.

What are indicators used to test for acids?

• Litmus paper, phenolphthalein, and methyl orange

• pH paper

• universal indicator

• bromothymol blue

Answer explanation

Litmus paper, phenolphthalein, and methyl orange are indicators commonly used to test for acids.

What is the Arrhenius definition of bases?

• Substances that dissociate in water to produce hydroxide ions (OH-)

• Substances that produce oxygen gas when dissolved in water

• Substances that release hydrogen ions (H+)

• Substances that do not react with water

Answer explanation

The Arrhenius definition of bases states that they are substances that dissociate in water to produce hydroxide ions (OH-) which is the correct choice in the answer options.

What are the characteristics of acids according to the Arrhenius theory?

• Acids have a bitter taste and turn blue litmus paper red

• Acids release hydroxide ions (OH-) in water

• Acids increase H+ concentration in water, have a sour taste, turn blue litmus paper red, and react with metals to produce hydrogen gas

• Acids do not dissociate in water

Answer explanation

Acids increase H+ concentration in water, have a sour taste, turn blue litmus paper red, and react with metals to produce hydrogen gas

How do Arrhenius acids and bases differ in terms of litmus paper color change?

• Arrhenius acids turn blue litmus paper red, while Arrhenius bases turn red litmus paper blue

• Arrhenius acids turn red litmus paper blue, while Arrhenius bases turn blue litmus paper red

• Arrhenius acids and bases both turn blue litmus paper red

• Arrhenius acids and bases both turn red litmus paper blue

Answer explanation

Arrhenius acids turn blue litmus paper red, while Arrhenius bases turn red litmus paper blue