Silver arsenite, Ag₃AsO₃

Addition of potassium hydroxide to a concentrated solution of Silver nitrate and arsenious acid precipitates yellow silver arsenite, Ag₃AsO₃. It is also produced, along with another yellow salt, 2Ag₂O,As₂O₃, by the action of potassium or ammonium arsenite on Silver nitrate. Silver arsenite melts above 150° C., decomposing into silver and silver arsenate. It is soluble in potassium-arsenite solution; and also dissolves in potassium-hydroxide solution and in ammonium hydroxide, yielding solutions from which metallic silver is gradually deposited.