Na3[IrCl6] + 3NH4Cl → (NH4)3[IrCl6] + 3NaCl
Sodium hexachloridoiridate(III) react with ammonium chloride to produce ammonium hexachloridoiridate(III) and sodium chloride. Ammonium chloride - saturated solution. This reaction takes place at a temperature near 10°C.