[en] The stability constants of the fluoride complexes of Al⁺³, H₃BO₃, Cr⁺³, Cr⁺⁶, Fe⁺³, Gd⁺³, Nb⁺⁵, UO₂⁺², and Zr⁺⁴ were determined in 0.96 and 2.88 M HNO₃ solutions in the temperature range 25 to 60⁰C with a fluoride specific ion electrode. These data can be used to calculate the concentration of chemical species in solution and will be used to correlate solution properties with solution composition. The solubilities of some fluoride precipitates were also measured in nitric acid solutions. The rates of formation of the fluoborates, aluminum fluoride, and zirconium fluoride complexes were measured with a fluoride specific ion electrode at 25, 35, and 45⁰C. The rates of formation of all complexes, except BF₄^-, AlF⁺², and a fluoride complex with aluminum containing more than three fluorides associated with it, were too fast to measure with the instrumentation used