Precipitation Reactions

• Making Soluble Salts


  1. Titration

  2. Note volumes of acid and alkali

  3. Repeat reaction without indicator

  4. Evaporate solution to dryness
• Making Soluble Salts using metal oxides


  1. Add excess base to appropriate acid

  2. Filter mixture

  3. Evaporate filtrate to dryness
• Precipitation reaction


  Reaction where two solutions are mixed and one of the products is a solid
• Obtaining a dry sample of precipitate

  1. Filter precipitate

  2. Evaporate liquid by heating solution
• Page 8 of the data booklet is used to decide whether or not a precipitate will form
• Precipitation reactions


  • Potassium iodide + lead(II) nitrate → potassium nitrate + lead iodide
  • Sodium hydroxide + aluminium chloride → sodium chloride + aluminium hydroxide
  • Ammonium carbonate + barium chloride → ammonium chloride + barium carbonate
  • Calcium chloride + lithium carbonate → calcium carbonate + lithium chloride
  • Nickel nitrate + potassium phosphate → nickel phosphate + potassium nitrate
  • Silver nitrate + sodium chloride → silver chloride + sodium nitrate
• Obtaining a solid, dry sample of the precipitate

  Evaporation + filtration