TY - JOUR
T1 - The Apparent Molal Volume and Adiabatic Compressibility of Some Organic Solutes in Water at 25 °C
AU - Surdo, Antonio Lo
AU - Shin, Charles
AU - Millero, Frank J.
PY - 1978/1/1
Y1 - 1978/1/1
N2 - The apparent molal volumes and adiabatic compressibilities of aqueous solutions of some ureas, thioureas, acetamlde, thioacetamide, dioxane, sugars, and succinic acid have been determined at 25 °C from precise density and sound measurements. The sugars have large negative values for the infinite dilution partial molal adiabatic compressibilities, °~ -16.2 (± 3.3)×10-4 cm-3 mol-1 bar-1 (of the same order of magnitude as amino acids) suggesting that these molecules are highly hydrated. Positive values of ° ~ 7.0 (± 2.6)×10-4 cm-3 mol-1 bar-1 are observed for dioxane, acetamide, thioacetamlde, tetramethylurea, and succinic acid suggesting very little hydration for these molecules in water. For urea, 1, 3-dimethylurea, and thiourea °~ -1.9 (± 1.5)×10-4 cm-3 mol-1 bar-1 suggesting these molecules are slightly hydrated. The degree of hydration increases with the number of functional groups which can hydrogen bond with water molecules. The substitution of sulfur for oxygen causes a decrease In hydration.
AB - The apparent molal volumes and adiabatic compressibilities of aqueous solutions of some ureas, thioureas, acetamlde, thioacetamide, dioxane, sugars, and succinic acid have been determined at 25 °C from precise density and sound measurements. The sugars have large negative values for the infinite dilution partial molal adiabatic compressibilities, °~ -16.2 (± 3.3)×10-4 cm-3 mol-1 bar-1 (of the same order of magnitude as amino acids) suggesting that these molecules are highly hydrated. Positive values of ° ~ 7.0 (± 2.6)×10-4 cm-3 mol-1 bar-1 are observed for dioxane, acetamide, thioacetamlde, tetramethylurea, and succinic acid suggesting very little hydration for these molecules in water. For urea, 1, 3-dimethylurea, and thiourea °~ -1.9 (± 1.5)×10-4 cm-3 mol-1 bar-1 suggesting these molecules are slightly hydrated. The degree of hydration increases with the number of functional groups which can hydrogen bond with water molecules. The substitution of sulfur for oxygen causes a decrease In hydration.
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U2 - 10.1021/je60078a005
DO - 10.1021/je60078a005
M3 - Article
AN - SCOPUS:0345693568
VL - 23
SP - 197
EP - 201
JO - Journal of Chemical & Engineering Data
JF - Journal of Chemical & Engineering Data
SN - 0021-9568
IS - 3
ER -