Silver sulfate is an inorganic compound with the formula Ag<sub>2</sub>SO<sub>4</sub>. It is a white solid with low solubility in water.
Silver sulfate precipitates when an aqueous solution of silver nitrate is treated with sulfuric acid:
It is purified by recrystallization from concentrated sulfuric acid, a step that expels traces of nitrate. Silver sulfate and anhydrous sodium sulfate adopt the same structure.
The synthesis of silver(II) sulfate (AgSO<sub>4</sub>) with a divalent silver ion instead of a monovalent silver ion was first reported in 2010 by adding sulfuric acid to silver(II) fluoride (HF escapes). It is a black solid that decomposes exothermically at 120 ðC with evolution of oxygen and the formation of the silver(I) pyrosulfate.