A dissertation on quick-lime and lime-water ... / [Charles Alston].

  • Charles Alston
Date:
1752
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Licence: Public Domain Mark

Credit: A dissertation on quick-lime and lime-water ... / [Charles Alston]. Source: Wellcome Collection.

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    indeed white at firft, but divides and foon difappears; the fmall Precipitation being abforbed, by the much greater Quantity of the Alcali: But two or three Drops of a Solution of Potafh, let fall into a Glafs of Lime-wa« ter, not only grow white at firft, but continue fo, fall¬ ing to the Bottom in Form of a white Powder. I might add. Lime-water precipitates dilTolved volatile Salts, which fixed Alcalies do not, as will prelently appear. Do not then thefe Experiments make it alfo more than probable^ that Quick-lime redifies or a6ls on al- caline fixed Salts, by feparating from them fome Part of the coarfeft of their Earth, and fubftituting in place thereof its own moft foluble and fubtile Part, whereby their Strength, as a Menftruum, is confiderably increa- fed ? Thus, Water affifted by a fixed Salt, may dif- folve and retain more of the Calx, than could be done by a much greater Quantity of Water by itfelf, even although the remaining Lime appear to be nothing, or not proportionally diminifhed j which accounts for a feeming Inconfifiency. I faid retain; becaufe a Lee made of Pot-afii and Quick-lime, expofed to the Air, does not, like Lime-water, throw up a Scum or Cruft, nor is weakened by boiling; on the contrary, the more it is boiled down, the ftronger it is. 7. The EiFedt of Calx vive on volatile Alcalies is no lefs remarkable. That it ftiould fet at Liberty the vo¬ latile Spirit of Sal Ammoniac, has nothing fingular in it; fince this can be done by Chalk, and fuch like Ab- forbents: But that the volatile Spirit diftilled from Sal Ammoniac, or Urine with Quick-lime, fhould be more acrid, more volatile, and yet not alcaline, nor reducible to a faline or folid Form, is the peculiar Ef- fedl of the Quick-lime fyj. Cum hinc inde ab autho- rihus (fays the learned 2,K.velfer) calcem ^vi^am tantopere ad jixationem falium <volatilium depnedicatam fcirem^ quod fal am7noniacum figeret (qute tamen Jixatio fucata ejiy uti expertus fiim) frequenter legeremy cum eadem experiment (y) Vid. Boerh. Chem. i. Procef. 97. & loy. C z ta
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