CONDUCTIMETRIA T2

July 3, 2019 | Author: yesica | Category: Química, Electromagnetismo, Ciencias físicas, Ciencia, Electricidad
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Teoria de conductimetria...

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CONDUCTIMETRÍA  MÉTODOS  MÉTODOS CONDUCTIMÉRICOS

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CONDUCTIMETRIA Generalidades 





Los métodos conductimétricos conductimétricos están basados en la conducción eléctrica de los iones en una disolución en presencia de un campo eléctrico. La conducción de la corriente eléctrica a través de la disolución de un electrolito supone la migración de las especies especies cargadas y depende del el numero , tamaño y movilidad de los iones. La conductividad es una medida de la concentración iónica total que tiene una disolución.

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CONDUCTANCIA ELECTRIC CONDUCTANCIA ELECTRICA A FUNDAMENTOS 



Al aplicar un potencial entre electrodos sumergidos en un electrolito se conduce corriente. Para estas disoluciones es válida la Ley de Ohm: V=I•R





R  es la resistencia del conductor (en Ohm, ), V  es   es la diferencia de potencial

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Potencial de CC o CA 



Potencial de CC : hay circulación de corriente en presencia de reacción  procesos farádicos  Z far Potencial de CA: migración de los iones  formación de Doble Capa Eléctrica en cada electrodo  capacitor  C dlc

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Circuito equivalente en la medida Conductimetrica

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 Medida Conductimétrica Conductimétrica 

Para medir la resistencia resistencia del electrolito electrolito Re.



Potencial Potencial aplicado de CA CA





Minimiza los procesos procesos de reacción reacción Zfar  alta.

Zdlc = 1/2 f.Cdlc baja  f altas ( 10002000 ) y tamaño grande de los electrodos. electrodos.

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 MEDIDA CONDUCTIMETRICA

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La resistencia de la solución como una medida de la capacidad de conducción del electrolito 

el área de la superficie de los electrodos

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Definiciones y relaciones importantes  l/A R resistencia=    l/A  es la resistividad (ohm • cm)

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Conductancia Equivalente  se define como la conductancia de un equivalente de soluto contenido contenido entre entre electrodos separados 1 cm. Medida experimental de



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Variación de la conductancia concentración

eq con

la

La movilidad de los iones depende de cuatro fuerzas Fuerza eléctrica y fuerza de fricción a dilución infinita Fuerzas de interacción ion-ion y solvente – ion ion a concentracion finita. 



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Conductancia Equivalente

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 Medida de Conductancia Conductancia

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DETERMINACION DE LA CONST CONSTANTE ANTE DE

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 MEDIDA DIRECT DIRECTA A

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