Online Encyclopedia

CO2H

Online Encyclopedia
Originally appearing in Volume V25, Page 893 of the 1911 Encyclopedia Britannica.
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CO2H I~H2 HCOH 02H, while the natural xylose, which produces l-tartaric acid by the substitution of CO2H for CHO.CHOH, corresponds to chloric, nitric, chloric, acetic, formic, sulphuric, oxalic, phosphoric, perchloric acids the specific rotation (calculated for the base) only varies from -272° to -288°; H. H. Landolt found the same thing for active acids, the mono lithium, sodium, potassium and ammonium tartrates varying only between 27.5° and 28.5° (calculated for the acid). A corresponding rule may be expected where both base and acid have rotatory power; the molecular rotation will be the sum of those for base and acid in salts with inactive radicles. Each of these rules finds sufficient explanation in Arrhenius's view of electrolytic dissociation, which admits that diluted electrolytes are split up in their ions, and so the salts of quinine (Q) owe their rotatory power to the ion QH, those of acid tartrates to the ion
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