3Cs2CO3 + 24Na2WO4 + 2Na2HPO4 + 52HCl → 2Cs3[PW12O40] + 3CO2 + 52NaCl + 27H2O
Cesium carbonate react with sodium tungstate, sodium hydrophosphate and hydrogen chloride to produce phosphododekatungstate cesium, carbon dioxide, sodium chloride and water. Hydrogen chloride - concentrated solution.