High Quality Content by WIKIPEDIA articles! 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 precipitate by the reaction between a soluble silver compound, such as silver nitrate with a soluble orthophosphate; its solubility product is 8.89x10-17. The precipitation reaction is analytically significant and can be used to in qualitatively or quantitative tests for phosphates. As well as being important in analytical chemistry, the precipitation of silver phosphate is also used in silver staining of biological materials (after reduction to silver metal) - as a magnifying agent for phosphate. Silver phosphate also found use in early photography as a light sensitive agent.

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