Silver phosphate or silver orthophosphate is a light sensitive, yellow, water-insoluble chemical compound composed of silver and phosphate ions of formula Ag3PO4.
Silver phosphate is formed as a yellow solid precipitate by the reaction between a soluble silver salt, such as silver nitrate, with a soluble orthophosphate.[3] Its solubility product is 8.89×10−17 mol4·dm−2.[4][5] The precipitation reaction is analytically significant[6] and can be used in qualitative or quantitative and quantitative analysis.[7]
This compound dissolves in aqueous ammonia.[3] Large crystals of silver phosphate form upon gradual evaporation of such ammoniacal solutions.
Its structure has been confirmed by X-ray crystallography.[8]
The precipitation of silver phosphate is useful in traditional analytical chemistry. Precipitation of silver phosphate is also used in silver staining of biological materials (after reduction to silver metal) - as a magnifying agent for phosphate.[9]
Silver phosphate also found use in early photography as a light sensitive agent.[10]
Silver phosphate exhibits antibacterial properties.[11]
Silver phosphate is a high (90%) quantum yield photocatalyst for the visible light photochemical splitting of water and for production of activated oxygen by the same method.[12]
Silver pyrophosphate Ag4P2O7 (CAS No. 13465-97-9)[13] can be prepared as a white precipitate from reaction of silver(I) and pyrophosphate ions. Like silver orthophosphate it is light sensitive. Silver orthophosphate turns red on exposure to light.[14] It has a density of 5.306 g/cm3 and a melting point of 585 °C.[15] A hydrate also exists which decomposes at 110 °C.[15]
Silver metaphosphate (AgPO3) (CAS No. 13465-96-8)[16] is a white solid with a density of 6.370 g/cm3 and a melting point of 482 °C. A hydrate also exists which decomposes at 240 °C.[15]
{{cite journal}}
Lokasi Pengunjung: 13.58.40.171