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Many insoluble salts of fluoride compounds strongly transmit light across a broad range of wavelengths, ranging from the ultraviolet to infrared regions of the electromagnetic spectrum. One such compound, magnesium fluoride is used to manufacture lenses in high quality telescopes. The endothermic dissolution reaction of magnesium fluoride in aqueous solution and its corresponding solublity product are given by: MgF2 (s) -> Mg2+ (aq) + 2F- (aq) Ksp = 7.4x10-9 at oC