1. Bicarbonate or Hydrogen carbonate   HCO3   HSO3   SO4   OH   Hint Half-n-half Clue   2. Bisulfite or Hydrogen sulfite   SO4   CO3   Cl   HSO3   Half-n-half Clue   3. Bromide   HCO3   Br   OH   SO4   Half-n-half Clue   4. Carbonate   PO4   SO4   CO3   Cl   Half-n-half Clue   5. Bisulfate or Hydrogen sulfate   OH   HSO4   NO3   Cl   Half-n-half Clue   6. Iodide   Cl   HCO3   I   CO3   Half-n-half Clue   7. Phosphate   OH   CO3   NO3   PO4   Half-n-half Clue