Some Chemical Reactions in Silica Gels : III. Formatin of Potassium Acid Tartarate Crystals
Creators:Kurz, Philip F.
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Citation:The Ohio Journal of Science. v69 n5 (September, 1969), 296-304
This work was concerned with investigating methods for growing potassium acid tartrate (KHT) crystals by chemical reaction in acidic gels prepared with tartaric acid (H2T) and sodium silicate and reacted with K+. H2T ranging from IN to 18N was used, and remarkable changes in size and perfection of shape of KHT crystals formed were noted as the concentration of H2T was increased. Gels made with H2T to 6N in strength permitted growth of mostly imperfect rhombohedra, some quite elongated and practically all veiled. Gels made with 8N, ION, 15N, and 18N H2T favored formation of clear, nonveiled, essentially perfectly shaped rhombohedra. KC1, KBr, KNO3, and K2SO4 appear equally useful as external reactants. KI permits growth of excellent crystals also, but forms HI, which reduces tartrate progressively to malate and succinate, releases I2, and produces an increasingly intense background color. K2Cr04 consumes tartrate in redox and prevents KHT formation. Potassium acetate causes gel cleavage and produces multitudes of clusters of tiny needles.
Author Institution: Battelle Memorial Institute, Columbus Laboratories, Columbus, Ohio
Rights:Reproduction of articles for non-commercial educational or research use granted without request if credit to The Ohio State University and The Ohio Academy of Science is given.
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