• S S Katti

      Articles written in Journal of Chemical Sciences

    • Volume change on mixing of isomeric butanols with normal heptane

      Anil Kumar S D Pradhan S S Katti

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      Volume changes on mixing of isomeric butanols withn-heptane have been determined at 25°C and that of tertbutanol at 26°C. All the four systems show a positive excess volume throughout concentration range. The excess volumes have been found to vary in the order of tert >sec >iso >n-butanols. The order of the excess volume has been attributed to breaking of hydrogen bonds of associated species of alcohol by dilution withn-heptane and more random distribution ofn-heptane molecules.

    • Excess thermodynamic properties of isomeric butanols withn-heptane at 55°C

      Anil Kumar Gopal Pathak S S Katti

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      The excess free energy, enthalpy and entropy of mixing of isomeric butanols withn-heptane determined at 55°C were found to be positive due to the breaking of hydrogen bonds. In the case ofn-butanol the excess entropy was negative beyond the concentration rangex2>0.4. The data on excess free energy and enthalpy of mixing could be well represented by the Redlich-Kister equation. An attempt to calculate excess enthalpy from temperature dependence of excess free energy for iso and sec-butanol systems has been made. The results are discussed in the light of the idealised model.

    • Excess thermodynamic properties of the binary mixtures of ethylenediamine with isomeric butanols

      S K Chaudhari S S Katti

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      Isothermal vapour-liquid equilibrium data at 333·15 K and excess molar volumes of mixing at 298·15K for the binary mixtures of ethylenediamine with isomeric butanols were measured over the entire mole fraction range. The values of molar excess free energy,GmE, and excess volumes,VmE, are negative for all the four systems, indicating strong specific interactions between two unlike molecules. The branching of the alkyl chain of alcohol also affects the excess properties considerably.

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