Definition from Wiktionary, the free dictionary
- (inorganic chemistry) Ordinary phosphoric acid, H3PO4
1861, William Odling, A Manual of Chemistry, Descriptive and Theoretical, Part 1, page 297:
- Metaphosphoric acid gives a white precipitate with nitrate of silver solution; orthophosphoric acid does not give any, save on the addition of an alkali, and the precipitate then produced is yellow.
1918, Herbert Royl Smith, The Laboratory Study of Chemistry, page 124:
- Evaporate 25 cc. of orthophosphoric acid solution to dryness, setting the burner beneath the dish and adjusting the flame so that the tip does not quite touch the dish.
2000, Nicholas P. Cheremisinoff, Practical Guide to Industrial Safety: Methods for Process Safety Professionals:
- With the exception of the fertilizer products, most phosphorus compounds are derived from orthophosphoric acid, produced by the oxidation of elemental phosphorus.