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In solid sodium chloride, the sodium and chloride ions are well arranged.
When sodium chloride dissolves in water, the sodium and chloride ions separate and become mobile.
Water molecules are polar. In the aqueous solution of sodium chloride, each sodium cation is surrounded by water molecules as the sodium cation attracts the negative ends of water molecules, while each chloride anion is also surrounded by water molecules as the chloride anion attracts the positive ends of water molecules.