Reversible reactions

Experiments

• A reversible reaction involving hydrated copper(II) sulfate and its anhydrous form
  The thermal decomposition of hydrated copper(II) sulfate and its regeneration by reacting the anhydrous copper(II) sulfate product with water.
• Ammonia fountain
  This spectacular demonstration highlights the high solubility of ammonia in water. The ammonia is shown to form an alkaline solution.
• An equilibrium involving chromate(VI) and dichromate(VI) ions
  The conversion of chromate(VI) to dichromate(VI) using acid and its reconversion using alkali is followed by colour changes.
• An equilibrium involving copper(II) ion
  The conversion of hexaaquacopper(II) ions, [Cu(H₂O)₆]²⁺, to tetraamminediaquacopper(II) ions, [Cu(NH₃)₄(H₂O)₂]²⁺, and their reconversion.
• Indicators and dry ice: demonstration
  A colourful and spectacular demonstration in which solid carbon dioxide (dry ice) is used to cause a colour change in one or more indicators.
• Red, white and blue!
  A colourful demonstration involving addition of ammonia to three colourless solutions, which turn turn red, milky white and blue respectively. Acidification reverses the colour changes.
• The reaction between carbon dioxide and water
  The acidic nature of carbon dioxide in solution in water is explored using exhaled air as the source of the gas, leading to an explanation of the reaction involved.