The reaction of rhodium(III) hydroxide with concentrated perchloric acid also produce rhodium(III) perchlorate.[2]
Rh(OH)3 + 3 HClO4 → Rh(ClO4)3 + 3 H2O
References
^Ayres, Gilbert H.; Forrester, John S. (1957). "The Preparation of Rhodium(III) Perchlorate Hexahydrate". Journal of Inorganic and Nuclear Chemistry. 3: 365–366. doi:10.1016/0022-1902(57)80042-6.
^Gilbert H. Ayres, John S. Forrester. The preparation of rhodium(III) perchlorate hexahydrate. Journal of Inorganic and Nuclear Chemistry, 1957. Vol.3, Iss.6, pp 365-366