Salts and Electrolysis

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  • Salts and electrolysis
    • Acids and Alkalis
      • Acid 1-6
        • H+ cations
      • Alkali 8-14
        • OH- anions
      • Neutral 7
    • Making a soluble salt (copper sulphate)
      • 1) 1 spatula of copper oxide to 25cm of sulphuric acid
      • 2) stir whilst warming must be excess powder
      • 3) filter excess CuO out
      • 4) heat copper sulphate solution
      • 5) put in an evaporating basin and leave at room temperature
    • Making an insoluble salt
      • 1) mix 25cm of magnesium sulphate and 25cm of sodium carbonate
      • 2) filter the mixture keep the residue
      • 3) rinse residue with distilled water
      • 4) leave to dry
    • Electrolysis
      • Molten
        • Simple split
        • Metal - catode
        • Non-metal + anode
      • Solution
        • Negative electrode the most reactive stays
        • Positive electrode halagon leaves if none will be oxygen
    • Aluminium Extraction
      • Ore: bauxite
      • Croyolite lowers melting point
      • Forms at Negative electrode
      • Oxygen reacts with the electrode
    • Electroplating
      • depositing a thin layer of a metal on an object through electrolysis
    • Colourful electrolysis
      • Electrolysis of brine
      • Positive electrode
        • colourless & red
        • Chlorine (bleach)
      • Negative electrode
        • Blue
        • Hydrogen

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