Acids and bases (an alkali is a soluble base) are aspects of chemistry that everyone seems to remember from their childhood science lessons, and yet they are rather difficult concepts to define! Most often we tend to think of acids as hydrogen ion (H+) donors and bases as hydrogen ion acceptors.
Topics 8.1 and 8.2 Introducing acids and bases and their reactions.
Topics 8.3, 8.4 and 8.5 Exploring the relative strengths of acids and bases and how we calculate pH.
Topic 18.2 Learning how to calculate the pH of weak acids and bases.
Topics 18.1 and 18.3 Exploring a different way of defining acids and bases, titration curves and buffer solutions.