HfOCl2 + 4KF + 2HF → K2[HfF6] + 2KCl + H2O
Hafnium(IV) oxide-dichloride react with potassium fluoride hydrogen fluoride to produce potassium hexafluorohafnate(IV), potassium chloride and water. Potassium fluoride - concentrated solution. Hydrogen fluoride - diluted solution.