Similarly to how the dielectric between the plates of a capacitor reduces the voltage between the plates, the dielectric effect of water decreases the work required to separate the anions and cations of an electrolyte solute as it dissolves.
Because the field between them is weaker with the interposition of a dielectric solvent, such as water, the separation of anions and cations of a dissolving electrolyte now occur at lower energy. The aqueous solvent weakens the electric field between the separating charges.
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