New physico-chemical properties of extremely diluted aqueous solutions

被引:70
作者
Elia, V [1 ]
Niccoli, M [1 ]
机构
[1] Univ Naples Federico II, Dept Chem, I-80126 Naples, Italy
关键词
aqueous solution; calorimetry; conductivity; pH; solute-solvent interaction; solutions;
D O I
10.1023/B:JTAN.0000027178.11665.8f
中图分类号
O414.1 [热力学];
学科分类号
摘要
The 'extremely diluted solutions' are anomalous solutions obtained through the iteration of two processes: a dilution 1: 100 in mass and a succussion. The iteration is repeated until extreme dilutions are reached (less than 1.10(-5) mol kg(-1)) to the point that we may call the resulting solution an extremely diluted solution, namely the composition of the solution is identical to that of the solvent used (e.g. twice distilled water). We conducted thermodynamic and transport measurements of the solutions and of the interaction of those solutions with acids or bases. The purpose of this study is to obtain information about the influence of successive dilutions and succussions on the water structure of the solutions under study. We measured the heats of mixing of acid or basic solutions with such,extremely diluted solutions', their electrical conductivity and pH, comparing with the analogous heats of mixing, electrical conductivity and pH of the solvent. We found some relevant exothermic excess heats of mixing, higher electrical conductivity and pH than those of the untreated solvent. The measurements show a good correlation between independent physico-chemical parameters. Care was taken to take into account the effect of chemical impurities deriving from the glass containers. Here we thus show that successive dilutions and succussions can permanently alter the physico-chemical properties of the water solvent. The nature of the phenomena here described still remains unexplained, nevertheless some significant experimental results were obtained.
引用
收藏
页码:815 / 836
页数:22
相关论文
共 30 条
[1]  
BARONE G, 1978, J SOLUTION CHEM, V3, P197
[2]  
Castronuovo G., 1997, CURR TOP SOLUTION CH, V2, P125
[3]   Liquid water and biological systems: The most important problem in science that hardly anyone wants to see solved [J].
Cho, CH ;
Singh, S ;
Robinson, GW .
FARADAY DISCUSSIONS, 1996, 103 :19-27
[4]   Thermodynamics of extremely diluted aqueous solutions [J].
Elia, V ;
Niccoli, M .
TEMPOS IN SCIENCE AND NATURE: STRUCTURES, RELATIONS, AND COMPLEXITY, 1999, 879 :241-248
[5]   New physico-chemical properties of water induced by mechanical treatments. A calorimetric study at 25%C [J].
Elia, V ;
Niccoli, M .
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2000, 61 (02) :527-537
[6]   Relationship between structural order and the anomalies of liquid water [J].
Errington, JR ;
Debenedetti, PG .
NATURE, 2001, 409 (6818) :318-321
[7]   SOLUTE INTERACTIONS IN DILUTE AQUEOUS-SOLUTIONS .5. MICRO-CALORIMETRIC STUDY OF POLYOLS AND THEIR MIXTURES WITH ALKANOLS [J].
FRANKS, F ;
PEDLEY, MD .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1983, 79 :2249-2260
[8]   Studies of Hydrophobic Bonding in Aqueous Alcohols: Enthalpy Measurements and Model Calculations [J].
Friedman, Harold L. ;
Krishnan, C. V. .
JOURNAL OF SOLUTION CHEMISTRY, 1973, 2 (2-3) :119-138
[9]   Enthalpies of dilution of mono-, di- and poly-alcohols in dilute aqueous solutions at 298.15 K [J].
Fujisawa, M ;
Maeda, M ;
Takagi, S ;
Kimura, T .
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2002, 69 (03) :841-848
[10]   The water dipole moment in water clusters [J].
Gregory, JK ;
Clary, DC ;
Liu, K ;
Brown, MG ;
Saykally, RJ .
SCIENCE, 1997, 275 (5301) :814-817