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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.
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Home › Acids › To Obtain Carbonic Acid
To Obtain Carbonic Acid
A solution of the crude acid mixed with a Dilute muriatic acid with 4 times its weight heated. little alcohol imparts a fine brown color to the hair, but stains the skin also. 3910. Το Obtain Pyrogallic Acid.
It may be prepared by heating gallic acid (previously dried at 212° Fahr.) in a glass retort, by means of a chloride of zinc bath, to 410°, when the pure acid sublimes, and forms in crystals on the neck of the retort, and in the receiver, which should be kept well cooled. of water, then pour it upon fragments of marble, previously placed in a tubulated retort. Carbonic acid gas will be rapidly evolved, and may either be collected in the mercurial pneumatic trough, or applied to immediate use. When wanted perfectly dry, it must be passed over dried chloride of calcium, or through concentrated oil of vitriol. This is the most convenient way of procuring the gas on the small scale, or in the laboratory. Or: Dilute oil of vitriol with 3 or 4 times its weight of water, then pour it on whiting placed in a suitable vessel, and apply agitation. This is the plan adopted on the large scale by the soda water makers. (See