31. Very similar results were observed in hydrofluoric acid solutions. 32. These compounds can be obtained by evaporating a hydrofluoric acid solution containing these both complexes. 33. Concentrated nitric and hydrofluoric acids do not rapidly attack yttrium, but other strong acids do. 34. This is usually an acid solution containing hydrofluoric acid . 35. Casimir de Marcassus was a chemist who introduced into France glass etching by hydrofluoric acid . 36. However, in acidic or alkaline conditions they can be hydrolyzed to monofluorophosphates and hydrofluoric acid . 37. Fluorine is used to fluorinate uranium tetrafluoride, itself formed from uranium dioxide and hydrofluoric acid . 38. Hydrofluoric acid absorption requires further medical treatment; calcium gluconate may be injected or administered intravenously.39. Raw lunar regolith would be refined by a variety of techniques, primarily hydrofluoric acid leaching. 40. Fire Department hazardous materials experts identified the substance as hydrofluoric acid , often used to etch glass.
