[Cr(NH3)6]Cl3 + HCl → [Cr(NH3)5Cl]Cl2 + NH4Cl
Hexaamminechromium(III) chloride react with hydrogen chloride to produce chloridopentaamminechromium(III) chloride and ammonium chloride. Hexaamminechromium(III) chloride - saturated solution. Hydrogen chloride - concentrated heated solution.