Why can't common salt dissolve in alcohol?
Answer:
It does dissolve, just at a lower level. The polar nature of salt requires a polar solvent to get into solution, and alcohol doesn't have much ability to stabilize the charge. It is more soluble in methanol than higher molecular weight alcohols.
The reason for the poor dissolving is because the polarity of the alcohol is not strong enough to overcome the salt's ionic attraction.
TRY TO MIX BLEACH WITH ALCHOHOL IN A 1 OR 2 LITER BOTTLE .
CLOSE CAP THEN THROW
DO NOT SHAKE !!
Alcohol is a nonpolar solvent. Common salt will not dissociate in alcohol.
The process of dissolving, called dissolution, is relatively straightforward for covalent substances such as ethanol. When ethanol dissolves in water, the ethanol molecules remain intact but form new hydrogen bonds with the water. When, however, an ionic compounds such as sodium chloride (NaCl) dissolves in water, the sodium chloride lattice dissociates into separate ions which are solvated (wrapped) with a coating of water molecules. Nonetheless, NaCl is said to dissolve in water, because evaporation of the solvent returns crystalline NaCl.
The solubility of one substance dissolving in another is determined by the balance of intermolecular forces between the solvent and solute and the entropy change that accompanies the solvation. Factors such as temperature and pressure will alter this balance, thus changing the solubility. Solubility may also strongly depend on the presence of other species dissolved in the solvent, for example, complex (chemistry) forming anions (ligands) in liquids. Solubility will also depend on the excess (or deficiency) of a common ion (common-ion effect). To a lesser extent, solubility will depend on the ionic strength of liquid solutions.
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