3Rb2CO3 + 24Na2MoO4 + 2Na2HPO4 + 52HCl → 2Rb3[PMo12O40] + 3CO2 + 52NaCl + 27H2O
Rubidium carbonate react with sodium molybdate, sodium hydrophosphate and hydrogen chloride to produce phosphododekarubidium molybdate, carbon dioxide, sodium chloride and water. Hydrogen chloride - concentrated solution.