C4 Acids and pH Quiz

What is the defining characteristic of strong acids?

• They have a high concentration

• They ionize completely

• They are dilute

• They are reversible

What does a double arrow in a chemical equation indicate?

• The reaction is reversible

• The reaction is irreversible

• The reaction is fast

• The reaction is slow

What is the relationship between acid strength and concentration?

• Acid strength is about the amount of acid in a volume, while concentration is about how much an acid associates

• Acid strength and concentration are the same thing

• Acid strength is about how much an acid associates, while concentration is about the amount of acid in a volume

• Acid strength and concentration are opposites

What does the pH scale measure?

• Concentration of carbon ions

• Concentration of hydrogen ions

• Concentration of oxygen ions

• Concentration of nitrogen ions

How does the pH change as the concentration of hydrogen ions increases?

• pH gets lower

• pH gets higher

• pH remains the same

• pH fluctuates

What does a decrease of one on the pH scale represent?

• Concentration of hydrogen ions decreasing by a factor of 10

• Concentration of hydrogen ions halving

• Concentration of hydrogen ions doubling

• Concentration of hydrogen ions increasing by a factor of 10

Why does a weak acid need to be more concentrated to achieve a low pH compared to a strong acid?

• Strong acids have a higher pH

• Fewer acid particles dissociate in a weak acid

• Weak acids have a higher pH

• More acid particles dissociate in a weak acid

What does it mean when the equilibrium of a weak acid lies to the left?

• More undissociated acid molecules than dissociated acid molecules at equilibrium

• More dissociated acid molecules than undissociated acid molecules at equilibrium

• Equal amounts of undissociated and dissociated acid molecules at equilibrium

• No acid molecules at equilibrium

What is the role of hydrogen ions in determining the pH of a solution?

• Hydrogen ions concentration determines the pH

• Hydrogen ions concentration decreases pH

• Hydrogen ions concentration has no effect on pH

• Hydrogen ions concentration increases pH

Why will a strong acid always have a lower pH than a weak acid at the same concentration?

• Weak acids have a lower pH than strong acids

• Strong acids have a higher pH than weak acids

• Higher proportion of weak acid molecules dissociate to release hydrogen ions

• Higher proportion of strong acid molecules dissociate to release hydrogen ions