6FeCl2 + 14HCl + K2Cr2O7 → 6FeCl3 + 2CrCl3 + 2KCl + 7H2O
Iron(II) chloride react with hydrogen chloride and potassium to dichromate produce iron(III) chloride, chromium(III) chloride, potassium chloride and water. Hydrogen chloride - diluted solution.