Ion Selective Electrodes / Response of the Glass Electrode

The hydrated glass interface is conductive due to the presence of hydrogen cations.

In each interface of the membrane an equilibrium is established:

H X^{+} (solution) + Gl X^{-} (glass) H X^{+} Gl X^{-} (glass)

A potential difference is again caused due to the difference in ionization.

The equilibrium's position depends on the concentration of

H^{+}

in each interface.

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