(Ions & Acids - a more complete list of polyatomic ions and their acids)
| CA | Polyatomic Ion | Formula | Ch | Add One H+ | Add Two H+ | ||||
| As | Arsenate | AsO43- | -3 | Hydrogen arsenate | HAsO42- | -2 | Dihydrogen arsenate | H2AsO4- | -1 |
| C | Acetate | C2H3O2- | -1 | ||||||
| C | Cyanide | CN- | -1 | ||||||
| C | Carbonate | CO32- | -2 | Hydrogen carbonate | HCO3- | -1 | |||
| C | Cyanate | OCN- | -1 | ||||||
| C | Thiocyanate | SCN- | -1 | ||||||
| Br | Perbromate | BrO4- | -1 | ||||||
| Br | Bromate | BrO3- | -1 | ||||||
| Br | Bromite | BrO2- | -1 | ||||||
| Br | Hypobromite | BrO- | -1 | ||||||
| Cl | Perchlorate | ClO4- | -1 | ||||||
| Cl | Chlorate | ClO3- | -1 | ||||||
| Cl | Chlorite | ClO2- | -1 | ||||||
| Cl | Hypochlorite | ClO- | -1 | ||||||
| I | Periodate | IO4- | -1 | ||||||
| I | Iodate | IO3- | -1 | ||||||
| I | Iodite | IO2- | -1 | ||||||
| I | Hypoiodite | IO- | -1 | ||||||
| N | Ammonium | NH4+ | +1 | ||||||
| N | Nitrate | NO3- | -1 | ||||||
| N | Nitrite | NO2- | -1 | ||||||
| O | Hydroxide | OH- | -1 | ||||||
| O | Peroxide | O22- | -2 | ||||||
| O | Superoxide | O2- | -1 | ||||||
| P | Phosphate | PO43- | -3 | Hydrogen phosphate | HPO42- | -2 | Dihydrogen phosphate | H2PO4- | -1 |
| S | Sulfate | SO42- | -2 | Hydrogen sulfate | HSO4- | -1 | |||
| S | Sulfite | SO32- | -2 | Hydrogen sulfite | HSO3- | -1 | |||
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Polyion Flash Cards - learn the vocabulary of the foreign language called Chemistry
Lewis Structures - how to draw them, and some examples
Three-Dimensional Molecular Models
How To write formulas of ionic compounds (salts)