Hexafluorosilicates

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. [Pg.142]

Magnesium, zinc and copper hexafluorosilicates, which are very soluble in water, are manufactured from hexafluorosilicic acid and the appropriate oxide and then recovered by evaporating the solution. [Pg.142]

Hexafluorosilicates are mainly used as preservatives in wood protection (particularly magnesium hexafluorosilicate). Sodium hexafluorosilicate is used in water fluoridation. [Pg.142]

Silicon, germanium, tin and lead can make use of unfilled d orbitals to expand their covalency beyond four and each of these elements is able (but only with a few ligands) to increase its covalency to six. Hence silicon in oxidation state -f-4 forms the octahedral hexafluorosilicate complex ion [SiFg] (but not [SiCl] ). Tin and lead in oxidation state -1-4 form the hexahydroxo complex ions, hexahydroxostannate(IV). [Sn(OH) ] and hexahydroxoplum-bate(IV) respectively when excess alkali is added to an aqueous solution containing hydrated tin(IV) and lead(IV) ions. [Pg.163]

Cryolite, see Sodium hexafluoroaluminate Cryptohalite, see Ammonium hexafluorosilicate Cupric and cuprous, see under Copper Cuprite, see Copper(I) oxide... [Pg.273]

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)... [Pg.274]

Thenardite, see Sodium sulfate Thionyl, see Sulflnyl Thorianite, see Thorium dioxide Topaz, see Aluminum hexafluorosilicate Tridymite, see Silicon dioxide Troilite, see Iron(II) sulflde... [Pg.275]

Chemical Designations - Synonyms Salufer Sodium fluosilicate Sodium hexafluorosilicate Chemical Formula Na SiF. ... [Pg.359]

Chemical Designations - Synortyms Zinc fluosilicate Zinc hexafluorosilicate Zinc silicofluoride hexahydrate Chemical Formula ZnSiFu fiHiO. [Pg.405]

AMMO 2.5 EC , cypermetlu-in, 13 Ammonia, 13 Ammonium acetate, 13 Ammonium arsenate, 13 Ammonium benzoate, 13 Ammonium bicarbonate, 13 Ammonium bifluoride, 14 Ammonium bisulfite, 14 Ammonium carbamate, 14 Ammonium carbonate, 14 Ammonium chloride, 14 Ammonium chlorplatmate, 14 Ammonium clu omate, 14 Ammonium citrate, 14 Ammonium diclu omate, 14 Ammonium fluoride, 14 Ammonium fomiate, 15 Ammonium hexafluorosilicate, 15 Ammonium hydroxide, 15 Ammonium metavanadate, 15 Ammonium molybdate, 15 Ammonium nitrate, 15 Ammonium oxalate, 15 Ammonium perfluorooctanoate, 15 Ammonium persulfate, 15 Ammonium phosphate, 15 Ammonium picrate, 16 Ammonium salicylate, 16... [Pg.321]

Other less widely used alternative diazonium salts for aryl fluoride synthesis include arenediazonium hexafluoroantimonates, ArN2SbFg, arenediazonium hexafluoroarsonates, ArN AsFg, and arenediazonium hexafluorosilicates, (ArNjljSiFg 114]... [Pg.275]

In the liquid state, hydrogen fluoride gives rise to a violent reaction with potassium hexafluorosilicate. [Pg.172]

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 ... [Pg.415]

Dining maintenance work on casings of fans used to extract perchloric acid fumes, seven violent explosions occurred when flanges sealed with lead oxide-glycerol cement were disturbed. The explosions, attributed to formation of explosive compounds by interaction of the cement with perchloric acid, may have involved perchlorate esters and/or lead salts. Use of an alternative inorganic silicate-hexafluorosilicate cement is recommended. [Pg.1358]

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