Preparation of ammonium bicarbonate
Ammonium bicarbonate is most readily obtained by dissolving commercial ammonium carbonate in water at 50° C and treating it with carbon dioxide while cooling. The delivery tube for the carbon dioxide must be moderately wide to prevent clogging. Filter the crystalline mass of bicarbonate which has separated out, on a Buchner funnel at once, and dry for several days in a desiccator over sulfuric acid.
The ammonium crystallizes out from the solution. Neither of these methods yields a product entirely free from carbonate.
Ammonium bicarbonate is quite soluble in water. The solution loses carbon dioxide at ordinary temperatures or on standing in the air. The dry salt is stable and odorless, but at 60° C. decomposes into ammonia, water, and carbon dioxide.
Inorganic chemical preparations, by Thorp, Frank Hall, 54-55, 1896
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