GCSE Chemistry - The pH Scale & Strong vs Weak Acids (Higher Tier) #35

The video explains the difference between strong and weak acids, focusing on their ionization in aqueous solutions. Strong acids fully ionize, while weak acids only partially ionize, establishing an equilibrium. The video also clarifies the distinction between acid strength and concentration, emphasizing that strength refers to ionization extent, while concentration is about the amount of acid in a solution. Finally, it covers pH, a measure of hydrogen ion concentration, noting that a lower pH indicates higher hydrogen ion concentration.

What defines a strong acid in terms of ionization?

• It partially ionizes in water.

• It ionizes only in non-aqueous solutions.

• It completely ionizes in water.

• It does not ionize in water.

What is the nature of the ionization process in weak acids?

• It is instantaneous.

• It does not occur.

• It is reversible.

• It is irreversible.

How does the concentration of hydrogen ions affect pH?

• Concentration has no effect on pH.

• Higher concentration decreases pH.

• Higher concentration stabilizes pH.

• Higher concentration increases pH.

What happens to the hydrogen ion concentration when pH decreases by one unit?

• It remains the same.

• It increases by a factor of 10.

• It doubles.

• It decreases by a factor of 10.

Which type of acid will have a lower pH at the same concentration?

• An acid with a neutral pH

• An acid with no hydrogen ions

• A strong acid

• A weak acid