pH and acids

What is the pH of an acid?

• Less than 7

• More than 7

• Exactly 7

• Cannot be determined

What happens when acids ionise in aqueous solutions?

• They release oxygen ions

• They release hydrogen ions

• They absorb hydrogen ions

• They become neutral

What is a hydrogen ion?

• A hydrogen atom that has lost one electron

• A hydrogen atom that has lost one neutron

• A hydrogen atom that has gained one proton

• A hydrogen atom that has gained one electron

What defines strong acids?

• They do not ionize in solution

• They partially ionize in solution

• They ionize reversibly in solution

• They ionize completely in solution

Which of the following is a weak acid?

• Ethanoic acid

• Hydrochloric acid

• Sulfuric acid

• Nitric acid

What is true about the ionization of weak acids?

• It is partial

• It is complete

• It does not occur

• It is irreversible

What does pH measure?

• The volume of the solution

• The concentration of oxygen ions

• The concentration of acid particles

• The concentration of hydrogen ions

What happens to the pH as the concentration of hydrogen ions increases?

• pH increases

• pH decreases

• pH remains the same

• pH becomes neutral

How does the pH change when the hydrogen ion concentration increases by a factor of 10?

• Decreases by 1

• Increases by 1

• Decreases by 10

• Increases by 10

Can a strong acid be dilute?

• Yes, if it ionizes partially

• No, strong acids are always concentrated

• Yes, concentration is independent of strength

• No, because it ionizes completely