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factor in determining the occurrence of ion association. A table of some typical values can be found under dielectric constant.Water has a relatively high dielectric constant value of 78.7 at 298 K (25 °C), so in aqueous solutions at ambient temperatures 1:1 electrolytes such as NaCl do not form ion pairs to an appreciable extent except when the solution is very concentrated. 2:2 electrolytes (1=''q''₁ = 2, 1=''q''₂ = 2) form ion pairs more readily. Indeed, the solvent-shared ion

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