Na3[RhCl6] + 3HCl → H3[RhCl6] + 3NaCl
Sodium hexachloridoiridate(III) react with hydrogen chloride to produce hexachloridorhodate(III) hydrogen and sodium chloride. hexachloridoiridate(III) sodium - concentrated solution. Hydrogen chloride - gas. This reaction takes place at a temperature of 0-5°C.