Precipitation

  • Created by: issey02
  • Created on: 30-09-18 15:09
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  • Precipitates
    • Precipitation
      • Solubility rules
        • Creating salts depends on whether its soluble or not
        • The product will either be a solution or a solid
      • A precipitate is an insoluble solid from a solution
    • Insoluble
      • Silver and lead chloride
      • Common carbonates and hydroxides but sodium, potassium and ammonium
      • Making insoluble salts: To makes a pure dry sample insoluble salt, use a precipitation reaction of 2 soluble salts and react them together.
        • Example to make insoluble lead chloride: lead nitrate + sodium chloride -> lead chloride and sodium nitrate
    • Soluble
      • Common salts of sodium potassium and ammonium
      • All nitrates
      • Common chlorides expect silver and lead
      • Common sulphates except lead barium and calcium
      • Making soluble salts
        • Method 1: reacting an acid that contains one of the ions you want in the salt and an insoluble base which contains the other ion, filter and evaporate
          • Example: copper oxide + sulphuric acid -> copper sulphate + water
        • Method 2: acid and alkali reaction using titration, evaporate and crystallise

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