2. Activities and concentrations

Thermodynamics shows that the potential adopted by an indicator electrode in a potentiometric chain is related to the activity a _i of the ion i to which the electrode responds. Activity, a thermodynamic quantity, is related to concentration, an experimental quantity, via the activity coefficient γ _i by the relationship :

a_{i} = γ_{i} [i]

^( 1 )

with :

a _i: (mol · L...

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Activities and concentrations

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Bibliography

(1) - CONWAY (B.E.) - Ionic interactions and activity behavior of electrolyte solutions (Interactions ioniques et activité dans les solutions d'électrolyte). - Chap. 2, p. 111-222. Dans CONWAY (B.E.), BOCKRIS (J.O'M.) et YEAGER (E.). – Comprehensive treatise of electrochemistry (Traité complet d'électrochimie). Plenum Press, New York, vol. 5,...