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Sumario EQUILIBRIO DE SOLUBILIDAD INTRODUCCION

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Este documento trata sobre las generalidades del equilibrio de solubilidad , los temas mas importantes. Lo toma desde una perspectiva para ayuda del estudiante a a hora de preparar el examen

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Equilibrio de solubilidad
DISOLUCIONES DE SALES
Disolución saturada (de una sal): aquélla que no admite que se
disuelva más cantidad de sal en ella
ella.
• Se establece un equilibrio entre el soluto puro (la sal) y la disolución
) equilibrio
saturada ((los iones de la sal): q de solubilidad.

Solubilidad de una sal, s: concentración de la sal en una
di l ió saturada
disolución t d d de lla misma.
i
• Se mide en mol/L (solubilidad molar).
• También se utiliza g/L.
g/L
disolución saturada
(de concentración s)



soluto puro

Fundamentos de Química (1º Grado en Física) 2011/2012 EQUILIBRIOS DE SOLUBILIDAD Y FORMACIÓN DE COMPLEJOS 3

, Producto de solubilidad

Sales solubles (en un disolvente): las de alta solubilidad:
sal (s) → sal (ac) → iones (ac)
Ejemplo: NaCl (s) → NaCl (ac) → Na+ (ac) + Cl– (ac)


Sales insolubles o poco solubles (en un disolvente): las de baja
l bilid d → equilibrio
solubilidad ilib i de
d solubilidad:
l bilid d
sal (s) sal (ac) → iones (ac)
sal (s) iones (ac)

AmBn (s) m An (ac) + nBm (ac)


Fundamentos de Química (1º Grado en Física) 2011/2012 EQUILIBRIOS DE SOLUBILIDAD Y FORMACIÓN DE COMPLEJOS 4

, Producto de solubilidad

• El producto de solubilidad, Kps, es la
constante del equilibrio de solubilidad: disolución saturada
(de concentración s)
Kps,T Producto de solubilidad de la
sal a la temperatura T soluto puro


AmBn (s) m An (ac) + nBm (ac)
a mA  a nB
K ps,T (AmBn ) 
n m


aA B m n


Considerando disolución ideal:


K ps,T (AmBn )  [An ]m [Bm ]n
Fundamentos de Química (1º Grado en Física) 2011/2012 EQUILIBRIOS DE SOLUBILIDAD Y FORMACIÓN DE COMPLEJOS 5

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