The pH of Vinegar

Calculating weak-acid pH

An interactive lesson with 5 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Weak acid: [H₃O⁺] ≈ √(Ka·C).
• Weak acids’ pH rises only ~0.5 per tenfold dilution.
• Weak bases: same method for [OH⁻], then pH = 14 − pOH.

Steps

1. A small x
2. Vinegar
3. Strong versus weak on one chart
4. Work backwards
5. A weak base