Zr(SO4)2 + K2SO4 + 4H2O → K2[Zr(H2O)2(SO4)3]•2H2O
Zirconium(IV) sulfate react with potassium sulfate and water to produce dihydrate potassium trisulfatodiaquazirconate(IV). This reaction takes place at a temperature near 0°C in the diluted solution sulfuric acid.