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Onsager Conductivity Equation – The equation is valid for highly dilute solutions of strong electrolytes. In the simplest case, for a fully dissociated mono-monovalent electrolyte (such as NaCl), the Onsager equation of electrical conductivity assumes the form J<sub>1</sub> = L<sub>11</sub>X<sub>1</sub> + L<sub>12</sub>X<sub>2</sub> J<sub>2</sub> = L<sub>21</sub>X<sub>1</sub> + L<sub>22</sub>X<sub>2</sub> Here J<sub>1</sub> is the flow of energy and J<sub>2</sub> the flow of matter. X<sub>1</sub> is the ‘force’ producing energy flow and X<sub>2</sub> that producing matter flow. L<sub>11</sub> is the coefficient for thermal conductance and L<sub>22</sub> the coefficients for diffusion. The coefficients L<sub>12</sub> and L<sub>21</sub> represent coupling of the flows with each other.
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