Hexafluorosilicic acid

Product Name :  Hexafluorosilicic acid
CAS No.:    16961-83-4
Formula:    H2sif6
formula weigh: 144.092
Melting point :  -20  to  -17 ºC
Boiling point :  108  to  109 ºC
Water soluble : soluble
Density : 1.22 g/cm³
Surface: Colorless transparent liquid

Fluorosilicic acid is a coordination acid, very acidic 0.03mol/L concentration of pH 1.6 (regardless of decomposition, acidity and nitric acid similar), if stored in plastic containers, stable in dilute solution at room temperature, the complex ion fluorosilicate root (SiF62-) is very stable, the presence of six F and a very symmetrical structure makes the negative charge can be very well dispersed, so that the fluorosilicic acid can be very good to release the Hydrogen ions, its salts have special solubility, potassium and barium salts are insoluble, rubidium salts are slightly soluble, sodium, lithium and ammonium salts are soluble, cesium salts, ferrous salts are extremely soluble. Heat decomposition releases toxic fluoride gas. It has strong corrosiveness.

Mainly used as raw material for the preparation of fluorosilicates and silicon tetrafluoride, also used in metal plating, wood preservation, beer sterilization, etc.