Ir2(SO4)3 + Cs2SO4 + 24H2O → 2{CsIr(SO4)2•12H2O}
Iridium(III) sulfate react with cesium sulfate and water to produce iridium(III)-cesium sulfate dodekahydrate. Iridium(III) sulfate and cesium sulfate - saturated solutions. This reaction takes place at a temperature near 0°C.