Potassium hexafluorosilicate

Heavy water, see Hydrogen[ H] oxide Heazlewoodite, see rn-Nickel disulfide Hematite, see Iron(III) oxide Hermannite, see Manganese silicate Hessite, see Silver telluride Hieratite, see Potassium hexafluorosilicate Hydroazoic acid, see Hydrogen azide Hydrophilite, see Calcium chloride Hydrosulfite, see Sodium dithionate(III)... 

In the liquid state, hydrogen fluoride gives rise to a violent reaction with potassium hexafluorosilicate. 

Another silicate ore treated by fluoridizing roasting is zircon. The ore is mixed with potassium hexafluorosilicate (K2SiF6) and heated in a rotary kiln at 650 to 700 °C to effect the reaction ... 

Potassium chloride White gelatinous precipitate of potassium hexafluorosilicate slightly soluble in water... 

Potassium hexafluoroplatinate(IV) may be identified by its x-ray powder diffraction pattern6 and infrared spectrum7 which in a Nujol mull has bands as follows 583(vs), 282(s), 259(ms) cm.-1. The crude product before recrystallization is sufficiently pure for most purposes but preparations carried out in quartz usually contain some potassium hexafluorosilicate, which may be detected by its very intense infrared absorptions at 741 and 483 cm.-1.8... 

Potassium chloride solution white, gelatinous precipitate of potassium hexafluorosilicate, K2[SiF6], from concentrated solutions. The precipitate is slightly soluble in water (1 77 g 1 at 25°), less soluble in excess of the reagent and in 50 per cent alcohol). 

Sodium and potassium hexafluorosilicate are manufactured by reacting alkali salts (e.g. chlorides) with hexafluoro-silicic acid and subsequent separation of the poorly soluble alkali hexafluorosilicates. 

Synonyms Potassium fluorosilicate (INCI) Potassium hexafluorosilicate Potassium silicofluoride Silicate, hexafluoro-, dipotassium... 

Berzelius himself told that from this moment it was simple to complete the discovery. He made SiF by reaction between quartz and hydrofluoric gas. When the silicon fluoride reacted with potash, a double fluoride, potassium hexafluorosilicate K SiF, was formed. In a glass tube he mixed this compound with pieces of potassium metal. On heating, a feeble detonation indicated that the silicon had been reduced and had formed potassium sUi-cide in the test tube. Water attacked potassium but left silicon undissolved. 

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