1. Bicarbonate or Hydrogen carbonate   SO3   OH   Cl   HCO3   Hint Half-n-half Clue   2. Sulfite   I   HCO3   CO3   SO3   Half-n-half Clue   3. Bromide   S   SO4   O   Br   Half-n-half Clue   4. Chloride   Cl   CO3   I   SO3   Half-n-half Clue   5. Ammonium   NH4   CO3   S   SO4   Half-n-half Clue   6. Iodide   I   SO4   HCO3   Br   Half-n-half Clue   7. Nitrate   SO3   NO3   OH   O   Half-n-half Clue