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Bicarbonate of Soda

This may be prepared from a solution of carbonate of soda treated in the same manner as for bicarbonate of potassa. (See No. 4183.) The U. S. Pharmacopœia directs carbonate of soda in small pieces to be enclosed in a box (having an air-tight lid, and an inner bottom perforated with holes), and thus subjected, until saturated, to a stream of carbonic acid gas previously passed through water.

Cooley recommends the following process:

Mix together 1 part carbonate of soda with 2 parts dried carbonate of soda, both in powder, and surround them with an atmosphere