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Contents

- 1 Overview: Acids, Bases and Buffers
- 2 Acids and Bases Introduction
- 3 The Acid Dissociation Constant Ka
- 4 Calculating the pH of Strong Acids
- 5 Calculating the pH of Weak Acids
- 6 Weak Acid Approximations
- 7 The Ionic Product of Water Kw
- 8 Calculating the pH of Strong Bases
- 9 Introduction to Buffer Solutions
- 10 Buffer Calculations 1
- 11 Buffer Calculations 2
- 12 pH Curves Strong Acid – Strong Base
- 13 pH Curves Strong Acid – Weak Base
- 14 pH Curves Weak Acid – Strong Base
- 15 pH Curves Weak Acid – Weak Base
- 16 Choosing the Right Indicator
- 17 All the K’s

#### Overview: Acids, Bases and Buffers

This is an overview of Topic 23: Acids, Bases and Buffers. It includes Brønsted–Lowry definitions of acids and bases, conjugate acid-base pairs, pH calculations, Ka and Kw calculations and how a buffer works and calculations.

#### Acids and Bases Introduction

Video explaining the Brønsted – Lowry definition of acids and bases, strong and weak acids and bases and conjugate acid-base pairs.

#### The Acid Dissociation Constant Ka

This video introduces the acid dissociation constant and provides worked examples.

#### Calculating the pH of Strong Acids

This video demonstrates how to calculate the pH of strong acids using examples.

#### Calculating the pH of Weak Acids

This video demonstrates how to calculate the pH of weak acids using examples.

#### Weak Acid Approximations

This video explains the reasoning behind the assumptions used in weak acid calculations.

#### The Ionic Product of Water Kw

This video explains how the Kw constant is derived and how its used in pH calculations for strong bases.

#### Calculating the pH of Strong Bases

This video uses many examples to demonstrate how to calculate the pH of strong bases.

#### Introduction to Buffer Solutions

Video explaining what buffer solutions are, how they are made and how they work.

#### Buffer Calculations 1

This video looks at how the constant used to calculate the pH of a buffer solution is derived and includes 3 typical exam style buffer calculations.

#### Buffer Calculations 2

This video looks at the Henderson-Hasselbalch expression and uses that expression explain the limits for buffer action.

#### pH Curves Strong Acid – Strong Base

This video demonstrates a titration to show the effect of adding strong base to strong acid via the colour changes of the indicator. These results are then used to draw a pH curve.

#### pH Curves Strong Acid – Weak Base

This video explains how to draw a strong acid-weak base pH curve.

#### pH Curves Weak Acid – Strong Base

This video explains how to draw a weak acid- strong base pH curve.

#### pH Curves Weak Acid – Weak Base

This video explains how to draw a weak acid- strong base pH curve.

#### Choosing the Right Indicator

This video highlights the importance of choosing the right indicator.

#### All the K’s

This video summarises all the different constants you need to know and when to use them.