2. Activities and concentrations

Thermodynamics shows that the potential adopted by an indicator electrode in a potentiometric chain is related to the activity of the electrode. $a_{i}$ ion $i$ to which the electrode responds. Activity, a thermodynamic quantity, is linked to concentration, an experimental quantity, via the activity coefficient $γ_{i}$ by the relation :

a_{i} = γ_{i}

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Activities and concentrations

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Chemical potential and electrochemical potential

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Bibliography

(1) - CONWAY (B.E.) - Ionic interactions and activity behavior of electrolyte solutions. - In Comprehensive treatise of electrochemistry vol. 5, CONWAY (B.E.), BOCKRIS (J.O'M.) et YEAGER (E.) (eds), Plenum Press, p. 111-222 (1983).
(2) - BATES (R.G.), STAPLES...

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