Reactions with water

• Na can react with water to form this equation

  2Na(s) +2H2O --> 2NaOH(aq) + H2(g)

  • This is a vigorous reaction
  • The metal fizzes rapidly and melts due to heat released
  • This forms a strong alkaline solution forming
• Magnesium reacts with cold water via the equation Mg(s) + 2H2O --> Mg(OH)2 (aq) + H2 (g)

  • Slow reaction
  • Only a few bubbles of gas are produced after a day or two
  • A weak alkali solution is produced

  It reacts faster in steam and form equation

  Mg(s) + H2O(g) --> MgO(s) + H2 (g)

  • Produces a bright white light
  • A white powder
• Chlorine reacts with water in two different ways

  Without sunlight:

  Cl2(g) + H2O (l) ⇌ HClO (aq) + HCl (aq)

  Forms chloric (|) acid and hydrochloric acid

  In sunlight:

  2Cl2(g) + 2H2O --> 4HCl (aq) + O2(g)