The PH Scale - Acids And Bases - National 4 Chemistry Revision - BBC

Home » What Are Acids And Bases » The PH Scale - Acids And Bases - National 4 Chemistry Revision - BBC

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In this guide

  1. Revise
  2. Test
  1. The pH scale
  2. Forming acids and alkalis
  3. Common acids and alkalis
  4. Diluting acids and alkalis
  5. Neutralisation
  6. Acids are neutralised by bases
  7. Acid rain

The pH scale

How acidic or alkaline a substance is (the pH of the substance) can be measured using the pH scale, a continuous range that stretches from below 0 to above 14. Most common pH values occur between 0 and 14.

Acids have a pH of less than 7.

Alkalis have a pH more than 7.

Water and neutral solutions have a pH of exactly 7.

A pH scale. Acids are numbered 0 to 6 and go from red to green in colour. 0 is the most acidic with 6 being the least. Neutral is in the middle has the number 7 and is dark green. Alkalis range from 8 to 14 going from a light green to dark purple. 8 is the least alkalic with 14 being the most.
Figure caption, The pH scale
Next pageForming acids and alkalis

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Related links

  • BBC Science
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