Lesson 3 of 7

The pH scale

Goal: Use the pH scale to describe how acidic or alkaline a liquid is.

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The pH scale runs from 0 to 14. It measures how acidic or alkaline a liquid is.

  • pH 7 is neutral.
  • Below 7 is an acid. The lower the number, the stronger the acid.
  • Above 7 is an alkali. The higher the number, the stronger the alkali.

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Key words in this lesson

Acid Has a pH below 7

Alkali Has a pH above 7

Neutral pH 7, neither acid nor alkali

pH scale Runs from 0 to 14

For teachers: AQA 3.6.2 · Pearson Edexcel 24.3 · Cambridge 7Cp.02