6 x 1 hour lessons

This module develops your understanding of acid–base chemistry with a strong focus on calculations. You’ll begin by revising definitions of acids and bases, before learning how to calculate the pH of strong and weak acids (using Ka)​. You’ll also explore the relationship between Ka​, pKa​, and acid strength.

The module continues with calculations involving strong bases and mixtures of acids and bases, followed by buffer solutions — how they work, how to prepare them, and how to calculate their pH. You’ll finish with titration curves, including how to choose a suitable indicator based on pH changes.

By the end of this module, you’ll be able to:

• Calculate pH for strong and weak acids

• Use KaK_aKa​, pKapK_apKa​, and equilibrium expressions

• Calculate pH of bases and acid–base mixtures

• Understand how buffer solutions resist changes in pH

• Calculate pH of buffer systems

• Interpret and sketch titration curves and select appropriate indicators

OCR (A) specification points covered: 5.1.3 Acids, bases and buffers