Lecture Notes for Chemical Students: Embracing Mineral And Organic Chemistry
Lecture Notes for Chemical Students: Embracing Mineral And Organic Chemistry
Edward Frankland
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oxide. anhydride. acid. oxytiichloride. OXALIC AC!ID. Occurrence. — In the form of tTie hydric potassic salt in Oxalic acetosella, and in the form of different salts in many other plants, and also in the animal organism. Preparation. — 1. Prom its elements through the medium of cyanogen. (See p. 222.) 2. By the oxidation of a large number of organic compounds. Most organic substances are converted by oxidizing agents into oxalic acid before their final transformation into carbonic anhydride and... water : thus sugar is transformed into oxalic acid by the action of nitric acid. 3. By heating sawdust with a mixture of potash and soda, oxalates of these bases are formed. Transformations, — 1. By the action of heat, oxalic acid is trans- 230 OBOANIC SADICALS. formed into carbonic anhjdride and oxatjlic hydride, or formic acid : — fCOHo _ no J- /H \COHo - **"» + jCOHo- Oxalic acid. Carbonic Formic add. anhydride. A portion of the formic acid is at the same time decomposed into water and carbonic oxide ; — tCOHo Formic add.
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