Products of acid-base reactions
The oxides (chlorides) give the oxoacids on reaction with excess water. These have one or more oxo groups (=O) at the central atom.
The oxoacids are converted to the anions by reaction with OH-.
Note that there is NO change in oxidation state. The oxidation state of N (or P) in the products of reaction with water or with hydroxide ion is the same as in the oxide(or chloride) that reacted to give these.
The oxoacids are converted to the anions by reaction with OH-.
Note that there is NO change in oxidation state. The oxidation state of N (or P) in the products of reaction with water or with hydroxide ion is the same as in the oxide(or chloride) that reacted to give these.
| Species in water | |||||
| Oxide (chloride) | H2O | at low pH (acid) | OH– | pH 7 and greater (base) | |
| nitrogen | +5 N2O5 | HNO3 nitric acid | NO3– nitrate | ||
| +3 N2O3 | HNO2 nitrous acid | NO2– nitrite | |||
| phosphorus | +5 P4O10 or PCl5 | H2O | H3PO4 phosphoric acid | OH– | H2PO4–, HPO42–, PO43– (phosphates) |
| +3 P4O6 or PCl3 | H3PO3 phosphorous acid | H2PO3–, HPO32– (phosphites) | |||