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Specific ion interaction theory
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<p>In <a href="/facts/Theoretical_chemistry/uqcyS5KH">theoretical chemistry</a>, Specific ion Interaction Theory (SIT theory) is a theory used to estimate single-<a href="/facts/Ion/wrbwhF3z">ion</a> <a href="/facts/Activity_coefficient/ImxE0u7t">activity coefficients</a> in <a href="/facts/Electrolyte/4YE8bIVa">electrolyte</a> solutions at relatively high <a href="/facts/Concentration/wqBmz5od">concentrations</a>. It does so by taking into consideration <i>interaction coefficients</i> between the various ions present in solution. Interaction coefficients are determined from <a href="/facts/Equilibrium_constant/yMTuuBbX">equilibrium constant</a> values obtained with solutions at various <a href="/facts/Ionic_strength/72GKfhmE">ionic strengths</a>. The determination of SIT interaction coefficients also yields the value of the equilibrium constant at infinite dilution. </p>