formulae and equations

• Ag has a 1+ charge
• Zn has a 2+ charge
• Al has a 3+ charge
• Ammonium / NH4 has a 1+ charge
• Nitrite / NO2 has a 1- charge
• Nitrate / NO3 has a 1- charge
• Hydrogencarbonate / HCO3 has a 1- charge
• MnO4 has a 1- charge
• Carbonate has a 2- charge
• Sulfate has a 2- charge
• Sulfite / SO3 has a 2- charge
• Dichromate (VI) / Cr2O7 has a 2- charge
• Phosphate / PO4 has a 3- charge