What is Hexafluorosilicic acid?
'''Hexafluorosilicic acid''' is a [[chemical compound]] that is an [[acid]]. Its chemical formula is H<sub>2</sub>SiF<sub>6</sub>. It is made by the reaction of [[hydrofluoric acid]] with [[silicon dioxide]] when the hydrofluoric acid is produced. It can be reacted with [[base (chemistry)|base]]s such as [[sodium hydroxide]] to produce a fluorosilicate [[salt]] such as sodium fluorosilicate. It is used to make artificial [[cryolite]]. It releases [[hydrogen fluoride]] when it is heated, so it is toxic like hydrofluoric acid. It is used in [[fluoridation]] of water. ==Related pages== *[[Silicate]] *[[Silicon]] *[[Fluoride]] {{chem-stub}} [[Category:Acids]]