K3[Fe(SCN)6] + 2H3PO4 H3[Fe(PO4)2] + 3KSCN + 3HSCN
Potassium hexathiocyanatoferrate(III) react with phosphoric acid to produce diorthophosphatoferrate(III) hydrogen, potassium thiocyanate and hydrogen thiocyanate. The reaction proceeds at room temperature.