2Rb2CO3 + 12Na2WO4 + Na2SiO3 + 26HCl → Rb4[SiW12O40] + 2CO2 + 26NaCl + 13H2O
Rubidium carbonate react with sodium tungstate, sodium metasilicate and hydrogen chloride to produce silicododekatungstate rubidium, carbon dioxide, sodium chloride and water. Hydrogen chloride - concentrated solution.