28 J. M. Ordway on Waterglass. 
ces, “alcohol by precipitation and subsequent washing, removes 
from waterglass a part of its potash.”+ But in several other 
precipitated” [from Fuchs’s waterglass] “with spirit of wine and 
washed with alcohol,” [till the spirit no longer showed a decided 
alkaline reaction]—" Ks Sij. 5. The salt separated from the 
former by washing’’ [with boiling water, which dissolved out 
K38ig]—“K Sip. 6. The salt which separates by the cooling of a 
concentrated solution of silica and carbonate of potash,—K Siye.” 
He also determined the formula of soda silicate to be NaSie,— 
as though there could be but one soda waterglass,—and found 
the precipitate from a cooling solution of silica in carbonate of 
to consist of Na Sig, 
Perhaps none of the substances in the list thus given, can 
properly claim anything more than an accidental existence. As 
e products of fusion, it is well known that silica and carbo- 
nate of potash may, within certain limits, be melted together in 
any proportion. And we shall proceed to show by examples 
selected from a large number of trials, that the variety of com- 
ig which may be thrown down by alcohol, is also un- 
There are two obvious methods of prosecuting the subject. 
The first is to make fractional precipitations from one and the 
same given silicate solution. The other is to redissolve and re- 
precipitate ad libitum, the successive products of integral precipi- 
tation, Sometimes one mode has been followed, sometimes the 
» and sometimes both plans have been united. 
Nias biel sitet | Z ; ea 
ab.” “Dieses 3 Milk aie Sees idk este, ae Gehek Waneeclon peg a 
unrein : ”— Ueber ein neues nutzbares Produkt aus Kiesel- 
erde und Kali”—pp, 15,16, 
t Poggendorff's Annalen, xxxv, p. 340, 
4 ype 
ee 
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