. Elements of modern chemistry . ng-ly in the air. Itsdensity is Inthis state it still re-tains water; butFremy obtained itanhydrous by de- =1composing dry hy-drogen potassiumdouble fluoride KFl,HFl, by heat in a platinum retort. This salt breaks up into potassium fluoride,which remains, and hydrofluoric acid, which is disengaged andmust be condensed in a platinum receiver cooled to —20°.Pure hydrofluoric acid is liquid at ordinary temperatures; itis very mobile, it freezes at —° and boils at °. It isextremely corrosive, and manipulations with it should be con-ducted with great c
. Elements of modern chemistry . ng-ly in the air. Itsdensity is Inthis state it still re-tains water; butFremy obtained itanhydrous by de- =1composing dry hy-drogen potassiumdouble fluoride KFl,HFl, by heat in a platinum retort. This salt breaks up into potassium fluoride,which remains, and hydrofluoric acid, which is disengaged andmust be condensed in a platinum receiver cooled to —20°.Pure hydrofluoric acid is liquid at ordinary temperatures; itis very mobile, it freezes at —° and boils at °. It isextremely corrosive, and manipulations with it should be con-ducted with great care. Its afiinity for water is so great thateach drop of the acid let fall into that liquid produces a hissingnoise, as would a red-hot iron. The solution is employed foretching upon glass, for hydrofluoric acid attacks and corrodes -that substance. This effect is due to the action of the acidupon the silica of the glass, which it converts into either sili-con fluoride or hydrofluosilicic acid, as will be seen farther
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Keywords: ., bookcentury1800, bookdecade18, booksubjectchemistry, bookyear1887
