Ti2(SO4)3 + Rb2SO4 + 24H2O → 2{RbTi(SO4)2•12H2O}
Titanium(III) sulfate react with rubidium sulfate and water to produce dodekahydrate rubidium-titanium(III) sulphate. This reaction takes place at a temperature near 0°C, in the diluted solution sulfuric acid.