complex ions

• carbon dioxide

  CO2
• Magnesium Oxide

  MgO
• Sodium Chloride

  NaCl
• Copper Sulphate

  CuSO4
• Sodium Hydroxide

  NaOH
• Sulphur dioxide

  SO2
• Water

  H2O
• Ammonia

  NH3
• Potassium Chloride

  KCl
• Magnesium Chloride

  MgCl2
• Hydrogen Sulphide

  H2S
• Methane

  CH4
• Hydrochloric acid

  HCl
• Nitrate

  NO3
• Hydroxide

  OH
• Sulfate

  SO4
• Carbonate

  CO3
• Phosphate

  PO4