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Apuntes del Tema 5 de Química de las Disoluciones Acuosas de UCV Ciencias del Mar: Propiedades Coligativas

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Apuntes sobre el Tema 5 de la asignatura de Química de las Disoluciones acuosas, del segundo cuatrimestre del primer año de la carrera de Ciencias del Mar, de la UCV.

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September 17, 2020
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2018/2019
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Tema 5 - Propiedades coligativas

Introducción a las propiedades coligativas
Las propiedades coligativas son propiedades características de las disoluciones
diluidas. Esta propiedades son de gran importancia, pues poseen grandes
aplicaciones en múltiples campos, como por ejemplo, la preparación de
inyectables. El valor de las propiedades coligativas es independiente de la
naturaleza química del soluto, y sólo dependen de la cantidad de partículas soluto
presente. En consecuencia, dos disoluciones acuosas de distintos solutos de la
misma concentración en partículas de soluto presentan los mismos valores en las
propiedades coligativas.




Descenso de la presión de vapor
Esta propiedad coligativa se define como la disminución de la presión de vapor
del disolvente por la adición de un soluto Viene definida por la siguiente fórmula:




Donde:

● ∆P​ :​ es el incremento de la presión de vapor (tiene valor negativo)

● M​1 ​: es la masa molecular del disolvente

● P​1​* : es la presión de vapor del disolvente en estado puro

● m: es la concentración total de solutos, expresadas en molalidad

El cociente depende exclusivamente del disolvente, y la molalidad exclusivamente
del soluto.




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