Chemical formulae

• Ammonia = NH3
• Sulphate = SO4 (Charge = -2)
• Hydroxide = OH (Charge = -1)
• Carbonate = CO3 (Charge = -2)
• Nitrate = NO3 (Charge = -1)
• Sulphide = S (Charge = -2)
• Ammonium = NH4 (Charge = +1)
• Half equations show the movement of electrons

  Eg. Na -> Na(+) + e(-)

  Eg. 2H(+) + 2e(-) -> H2