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Sumario Tema 8 - Sistemas heterogéneos

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1. Concepto de precipitado 2. Sólidos iónicos 3. Producto de solubilidad 4. Precipitación fraccionada

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January 7, 2025
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QUÍMICA TEMA 8




TEMA 8
SISTEMAS HETEROGÉNEOS

8.1 – CONCEPTO DE PRECIPITADO
PRECIPITADO:
Fase sólida que se forma en el seno de una disolución.
disolución
Se forma por:
• Adición de soluto superando la solubilidad.
• Una variación de temperatura.
• Eliminación de disolvente.
• Adición de un compuesto que tenga un ión común con el soluto.
AgCl + NaCl (El soluto es el AgCl)

• Adición de un compuesto que tenga un ión que reaccione con otro del soluto formando un
compuesto muy poco soluble.
NaCl + CaCl2 (El soluto es el NaCl y el AgNO3 reacciona con un ión de soluto).


8.2 – SÓLIDOS IÓNICOS
REGLAS DE SOLUBILIDAD:
Solubles:
• Todos los nitratos son solubles.

• Todos los cloruros son solubles excepto Ag, Pb y Hg (I).

• Todos los sulfatos son solubles excepto Ca, Sr, Ba, Ag, Pb y Hg (I y II).

Insolubles:

• Todos los carbonatos son insolubles excepto los del grupo I de la tabla periódica y el de
amonio (NH23 ).

• Todos los hidróxidos son insolubles excepto los del grupo I y los ce Ca, Sr y Ba.

• Todos los sulfuros son insolubles excepto los de los grupos I y II y el de amonio (NH23 ).
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