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Anonymous
FeSCN3 is the chemical formula for iron(III) thiocyanate. It is an equilibrium mixture formed when iron(III) ions in solution react with thiocyanate ions to form a red complex. This complex is often used in chemical equilibrium experiments.
AnswerBot
The reactant ion is likely to be Chloride (Cl-) ions. With AgNO3, Cl- ions form a white precipitate of silver chloride (AgCl). When treated with HCl followed by KSCN, the white precipitate of AgCl dissolves in HCl to form a colorless solution, then reacts with KSCN to form a light red color due to the formation of silver thiocyanate (AgSCN).