• Mukhtar Singh

      Articles written in Journal of Chemical Sciences

    • Studies on the electrochemical and thermodynamic behaviour of tin-tin sulphide electrode in the presence of sulphide ions

      Pushpa Sharma Mukhtar Singh

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      Tin-tin sulphide (Sn-SnS) electrode has been prepared. Statistical analysis indicates that this electrode is stable and reproducible. It has been found that the electrode can be used in the quantitative determination of S2− in the presence of foreign ions such as F, Cl, Br, I, HCO3, CO32−, SO42−, SO42− and NO3. The potential of the electrode in the presence of S2− has been measured by setting up the following type of cell: Sn-SnS/S2− (saturated) KCl/Hg2Cl2, Hg. The electrode shows Nernstian response to pS (−log[S2−]) over the range 7·09 to 12·26. The electrode also shows the Nernstian response to pH in the range 7·54 to 11·98 at constant pS. Values ofE0, (∂E0/∂T)P and various thermodynamic functions,viz., ΔG0, ΔH0 and ΔS0 for the electrode reaction, Sn(s)+S2−(aq) ⇌ SnS(s)+2e, have been determined. Besides, the standard free energy of formation (ΔGt0) and solubility product constant (Kap) of SnS in aqueous medium at 25±0·1°C have also been determined.

    • Polarographic study of mixed ligand complexes:Pb(II)-succinate-imidazole system

      Madhu Shivhare Mukhtar Singh

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      The mixed ligand complexes of succinate (Succ2-) and Imidazole (Im) with Pb(II) have been studied polarographically at constant ionic strength, μ=2.0 (NaNO3) and at pH 6. The system has been studied at constant temperature, 25±0.1°C. The reduction of the complexes at dropping mercury electrode is reversible and diffusion-controlled. Three mixed complexes,viz., [Pb(Succ)(Im)]: [Pb(Succ)(Im)2] and [Pb(Succ)2(Im)]2- are formed.

    • Studies on the electrochemical and thermodynamic behaviour of Hg-HgS electrode in the presence of sulphide ions

      Pravin Chandra Katiyar Mukhtar Singh

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      Mercury-mercury (II) sulphide electrode has been prepared and its electrochemical and thermodynamic behaviour has been studied in different media. The electrode is found to show Nernstian response to pS (− log [S2−]) over the range 5.19–10.38. In the pH range 7.96–11.98, at constant [S2−]v, its response is also Nernstian. The values of thermodynamic functions, viz., ΔG0. ΔH0, and ΔS0 for the electrode reaction: Hg(3)+S2−⇌HgS(s)+2e, have been determined. Further, the standard free energy of formation (ΔGf0) and solubility product constant (Kvp) of HgS in aqueous medium at 25±0.1°C have also been determined.

    • Studies on silver-silver carboxylate indicator electrodes: Part 1—The silver-silver acetate electrode

      Abha Rani Rai Mukhtar Singh

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      Silver-silver acetate (Ag−Ag Acet) electrodes have been prepared and their electrochemical and thermodynamic behaviour studied in different media containing acetate ions. The linear relationship between electrode potential and log[CH3COO] shows that this electrode can be used in the quantitative determination of CH3COO in aqueous, aquoalcoholic and alkaline media. The values of thermodynamic functions, viz. ΔG0, ΔH0 and ΔS0 for the electrode reaction have been determined. The standard free energy of formation (ΔGf0) and solubility product constant (Kzp) of CH3COOAg in aqueous medium at 25°C have also been determined.

    • Viscometric and thermodynamic studies of interactions in ternary solutions containing sucrose and aqueous alkali metal halides at 293·15, 303·15 and 313·15 K

      Reena Gupta Mukhtar Singh

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      Viscosities and densities of sucrose in aqueous alkali metal halide solutions of different concentrations in the temperature range 293.5 to 313.15 K have been measured. Partial molar volumes at infinite dilution (V20) of sucrose determined from apparent molar volume (φv) have been utilized to estimate partial molar volumes of transfer (V2,tr0) for sucrose from water to alkali metal halide solutions. The viscosity data of alkali metal halides in purely aqueous solutions and in the presence of sucrose at different temperatures (293.15, 303.15 and 313.5 K) have been analysed by the Jones-Dole equation. The nature and magnitude of solute-solvent and solute-solute interactions have been discussed in terms of the values of limiting apparent molar volume (φv0), slope (Sv) and coefficients of the Jones-Dole equation. The structure-making and structure-breaking capacities of alkali metal halides in pure aqueous solutions and in the presence of sucrose have been ascertained from temperature dependence ofφv0.

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