http://nopr.niscpr.res.in/handle/123456789/20188 2026-10-09T17:45:04Z http://nopr.niscpr.res.in/handle/123456789/20236 Title: Aquo complexes of simple Cu⁺, Ag⁺ and Au⁺ ions and the acidities of metal aquo ions. A heat of hydration analysis and PM3 calculations Authors: Naskar, Jnan Prakash; Datta, Dipankar Abstract: It is shown that the heats of hydration (Δ<i>H</i>⁰) of some 37 metal ions (excluding Cu⁺, Ag⁺ and Au⁺) with charge Z on them varying from +1 to +4 can be reproduced with an average error of 3.8 (± 2.7) % by the following equation: Page(s): 2202-2207 2005-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/20235 Title: Enthalpy of dissolution of the complex Zn(Leu)SO₄·l/2H₂O (s) Authors: Di, You-Ying; Tan, Zhi-Cheng; Gao, Sheng-Li Abstract: Molar enthalpies of dissolution of [ZnSO₄·7H₂O (s) and Leu(s)] mixture [<i>n</i> (ZnSO₄·7H₂O) : <i>n</i> (Leu) = 1 : 1] and the complex Zn(Leu)SO₄·l/2H₂O (s) in 100 cm^-3 of 2 mol·dm^-3 HCl at (298.15 ± 0.001) K have been determined to be Δ_d<i>H</i>^o_m.1 = -(84.943 ± 0.090) kJ-mol^-1 and Δ_d<i>H</i>^o_m.3 = (55.967 ± 0.060) kJ-mol^-1, respectively, using an isoperibol solution-reaction calorimeter. The standard molar enthalpy of formation of the complex Zn(Leu)SO₄·l/2H₂O (s) has been found to be Δ_f<i>H</i>⁰_m Zn(Leu)SO₄·l/2H₂O ,s, 298.15 K) =-(1998.155 ± 0.965) J·mol^-1, on the basis of experimental values of enthalpies of dissolution with some auxiliary thermodynamic data through a designed Hess thermochemical cycle. The constant-volume combustion energy of the complex Zn(Leu)SO₄·l/2H₂O (s) has been measured to be Δc<i>E / </i>J.g^-1 = -(9971.85 ± 11.27) by a precision rotating bomb combustion calorimeter at 298.15 K. The standard molar enthalpy of combustion and formation of the compound have been calculated to be Δ_c<i>H</i>⁰_m =-(3007.889 ± 3.399) kJ.mol^-1 and Δ_f<i>H</i>⁰_m Zn(Leu)SO₄·l/2H₂O (s)=-(2001.251 ± 3.503) J·mol^-1. The relative deviation of results obtained from the two calorimetric methods agree with each other and is within ± 0.2%. Page(s): 2274-2278 2005-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/20234 Title: Corrosion and inhibition kinetics of PVA polymer on carbon steel in sulfuric acid solution Authors: Shukla, Jyotsna; Pitre, K S Abstract: A new voltammetric method to determine the corrosion rates at short time intervals has been developed. Variation of metal corrodibility, solution corrosiveness and corrosion rates have been reported as a function of time. The corrosion inhibition efficiency of PVA (polyvinyl acetate) is 91 % after 24 hours. Using the proposed method it is also possible to determine simultaneously, the corrosion rates with respect to Fe(II) and Fe(III). Page(s): 2270-2273 2005-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/20233 Title: Photoreduction of congo red by ascorbic acid and EDTA over cadmium sulphide as photocatalyst Authors: Kothari, Shilpa; Vyas, Ritu; Ameta, Rakshit; Punjabi, Pinki B Abstract: The photoreduction of congo red in presence of CdS and ascorbic acid or EDTA has been carried out. The effect of different parameters like <i>p</i>H, light intensity, concentrations of congo red and reductants and amount or semiconductor on the rate of photocatalytic reaction has been studied. On the basis of observed data, a tentative mechanism for the photoreduction of congo red has been proposed. Page(s): 2266-2269 2005-11-01T00:00:00Z