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Ionic conductivity (denoted by λ) is a measure of a substance's tendency towards ionic conduction. Ionic conduction is the movement of ions . The phenomenon is observed in solids and solutions.
Ionic conductivity may refer to: Conductivity (electrolytic) , electrical conductivity due to an electrolyte separating into ions in solution Ionic conductivity (solid state) , electrical conductivity due to ions moving position in a crystal lattice
Conductivity measurements are used routinely in many industrial and environmental applications as a fast, inexpensive and reliable way of measuring the ionic content in a solution. [1] For example, the measurement of product conductivity is a typical way to monitor and continuously trend the performance of water purification systems.
In practice the molar ionic conductivities are calculated from the measured ion transport numbers and the total molar conductivity. For the cation + = + +, and similarly for the anion. In solutions, where ionic complexation or associaltion are important, two different transport/transference numbers can be defined.
Electrical conductivity of water samples is used as an indicator of how salt-free, ion-free, or impurity-free the sample is; the purer the water, the lower the conductivity (the higher the resistivity). Conductivity measurements in water are often reported as specific conductance, relative to the conductivity of pure water at 25 °C.
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In fact, conductivity measurements show that ionic mobility increases from Li + to Cs +, and therefore that Stokes radius decreases from Li + to Cs +. This is the opposite of the order of ionic radii for crystals and shows that in solution the smaller ions (Li +) are more extensively hydrated than the larger (Cs +). [2]
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