Freezing point of water is lowered on dissolving NaCl in water.Explain

Asked by j4jaigupta1998 | 9th Jun, 2015, 09:50: AM

Expert Answer:

When sodium chloride or NaCl dissolves in water, each molecule separates into sodium ions (Na+) and chloride ions (Cl-), which mix separately among the water molecules. These ions affect the water molecules and their freezing point.

Water molecules form crystals when they freeze (ice). But when there is a salt in the water, the Na+ and Cl- ions get in the way of the water molecules, making it more difficult for them to rearrange into crystals. Salt disrupts this equilibrium. It is a colligative property. The molecules of water use energy to exclude the sodium ions and chloride ions and thus freeze at lower temperatures.

Answered by Hanisha Vyas | 9th Jun, 2015, 03:00: PM

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