Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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To Obtain Carbonic Oxide
gas entirely from muriatic acid, it may be Carbonic oxide may be obtained from carbonic acid gas by passing the latter over fragments of charcoal heated to redness in a tube of porcelain or iron. passed through water; and to render it dry, it may be passed over dry chloride of calcium.
Chlorine gas may also be collected over a saturated solution of common salt in the pneumatic trough, if the presence of moist- Also, by treating binoxalate of potassa with 5 or 6 times its weight of oil of vitriol ure be no objection. (See No. 4031.) in a glass retort, at a gentle heat.
Equal weights of chalk (or carbonate of soda) and iron filings (or charcoal), strongly heated in an iron retort or gun barrel, will evolve the gas rapidly.
Whichever way the gas is evolved, it must be passed first through a caustic alkaline solution or milk of lime, to deprive it of carbonic acid, and next over dried chloride of calcium, to deprive it of moisture. It may be collected either over mercury or water, as the latter absorbs but very little.