Acids, Bases & pH

A logarithmic scale

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• pH = −log₁₀[H⁺]; 7 is neutral, lower is acidic, higher is alkaline.
• Each pH unit is a factor of 10 in H⁺ concentration.
• At the equivalence point of a titration, acid and base cancel exactly.

Steps

1. Counting hydrogen ions
2. From concentration to pH
3. How much more acidic?
4. Dilute it
5. Diluting forever
6. A titration
7. Stronger alkali