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When polar molecules enter water, they attract water molecules, which surround them and carry them off into solution. Salt dissolves so well because it completely dissociates into positive and negative ions in water. ... At that point, the solution is saturated, and no more salt can dissolve...
Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. The amount of a substance that can dissolve in a liquid (at a particular temperature) is called the solubility of the substance.

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