12.1.1

Acids and Alkali Indicators

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Acids and Alkalis

Acids and alkalis are on the opposite ends of the pH scale. They combine to form water, which is neutral.

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Acids

  • Acids are substances that form hydrogen (H+) ions when they dissolve in water (aqueous solutions).
  • Acids are proton donors.
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Alkalis

  • Alkalis are substances that form hydroxide (OH-) ions when they dissolve in water (aqueous solutions).
  • Alkalis can neutralise acids.
  • An alkali is a type of base. An alkali is a base that's soluble in water.
  • Bases are proton acceptors.
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Measured using pH scale

  • The pH scale is used to measure how acidic or alkaline a substance is.

Jump to other topics

1States of Matter

2Elements, Compounds & Mixtures

3Atomic Structure

4The Periodic Table

5Chemical Formulae, Equations & Calculations

6Bonding

7Electrolysis

8Groups of the Periodic Table

9The Atmosphere

10Reactivity Series

11Metal Extraction

12Acids & Alkalis

13Chemical Tests

14Physical Chemistry

15Organic Chemistry

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