Publicado

2016-01-01

Interacciones moleculares de las soluciones acuosas diluidas de nitrato de sodio a partir de datos viscosimétricos

Molecular interactions of aqueous sodium nitrate solutions from viscometric data

Palabras clave:

mezclas binarias, viscosidad dinámica, parámetros de activación, Jones-Dole (es)
binary mixtures, dynamic viscosity, activation parameters, Jones-Dole (en)

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Autores/as

  • Manuel S. Páez Universidad de Córdoba
  • Dairo E. Pérez Universidad de Córdoba
  • Oscar L. Julio Universidad de Córdoba

Se determinaron experimentalmente los tiempos de flujo de soluciones NaNO3 + H2O en el intervalo de concentración molal 0,0000-0,9996 (mol/kg) . Se usó un microviscosímetro automático Anton Paar®, modelo AMVn, a temperaturas desde 283,15 K hasta 318,15 K cada 5 K y presión atmosférica de 0,101 MPa. A partir de los datos obtenidos, se calcularon las viscosidades dinámicas (), los coeficientes de viscosidad,  y  de la ecuación de Jones-Dole,  y los parámetros de activación del flujo viscoso (,   y ) a dilución infinita. Los coeficientes  resultaron positivos al igual que . De acuerdo con el análisis del signo de este último, el NaNO3 actúa como un soluto formador de la estructura del agua. Por otro lado, los parámetros de activación del flujo viscoso a dilución infinita (,  y ) revelaron que el proceso de flujo viscoso es endotérmico con un claro predominio de las interacciones ión-solvente.

Flow times of aqueous sodium nitrate solutions in the molal concentration interval 0.0000 to 0.9996 (mol/kg) were determined by using an automatic microviscosimeter AMVn Anton Paar® at temperatures ranging from 283.15 K to 318.15 K every 5 K and atmospheric pressure of 0.101 MPa. From the data obtained, the dynamic viscosities (), the viscosity coefficients , , and  form the Jones-Dole equation,  and the activation parameters of viscous flow (,  and ) at infinite dilution were calculated. The coefficients , , and  were positive as well as . On the one hand, according to the sign analysis, sodium nitrate acts as a structure-forming solute of the water. On the other hand, the activation viscous flow parameters at infinite dilution (,  y )  revealed that the viscous flow process is endothermic with a clear ion-solvent interactions predominance.

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