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Solvent
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===Polar protic and polar aprotic=== Solvents with a dielectric constant (more accurately, [[relative static permittivity]]) greater than 15 (i.e. polar or polarizable) can be further divided into [[protic]] and aprotic. Protic solvents, such as [[water]], solvate [[anion]]s (negatively charged solutes) strongly via [[hydrogen bonding]]. [[Polar aprotic solvent]]s, such as [[acetone]] or [[dichloromethane]], tend to have large [[Molecular dipole moment|dipole moments]] (separation of partial positive and partial negative charges within the same molecule) and solvate positively charged species via their negative dipole.<ref>Lowery and Richardson, p. 183.</ref> In [[chemical reaction]]s the use of polar protic solvents favors the [[SN1 reaction|S<sub>N</sub>1]] [[reaction mechanism]], while polar aprotic solvents favor the [[SN2 reaction|S<sub>N</sub>2]] reaction mechanism. These polar solvents are capable of forming hydrogen bonds with water to dissolve in water whereas non-polar solvents are not capable of strong hydrogen bonds.
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