GCSE Chemistry Unit 3 Revision (6)

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Acids, Alkalis and Titrations

  • Acids can be strong or weak.
  • Strong acids like sulphuric acid ionise almost completely in water. 
  • This means almost every hydrogen atom is released to become a hydrated proton. (A large number of H+ (aq) ions are formed
  • Weak acids like citric acid ionise only very slightly.
  • This means only some of the hydrogen atoms in the compound are released, so a small number of H+ (aq) ions are formed.
  • The pH of an acid or alkali is a measure of the concentration of H+ (aq) ions in a solution.
  • Strong acids typically have a pH f about 1 or 2, whilst the pH of a weak acid could be 5 or 6.
  • The pH of an acid or alkali can be measured with a pH meter or with universal indicator…


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