C5

Question 0

Describe the differences between strong and weak acids in water.

Answer 0

• A strong acid ionises completely in water.

* A weak acid does not fully ionise in water. Also it is a reversible reaction making it an equilibrium mixture.

Question 1

Give three examples of strong acids.

How are they different to weak acids?

Answer 1

• Hydrochloric acid
• Nitric acid
• Sulphuric acid
They have a lower pH than weak acids at the same concentration

Question 2

Describe the difference between the concentration and the strength if an acid.

Answer 2

• The concentration is how many moles of acid is dissolved in 1dm3.
• The strength of an acid is determined by the way it ionises. A strong acid produces more H+ ions than a weak acid at the same concentration.