Which of the following statements is correct about the effect of dissolved salt on the freezing point of water? A The freezing point is loweredB The freezing point is increasedC There is no change in the freezing pointD The change in the freezing point depends on the temperature of the surrounding
Question
Which of the following statements is correct about the effect of dissolved salt on the freezing point of water? A The freezing point is loweredB The freezing point is increasedC There is no change in the freezing pointD The change in the freezing point depends on the temperature of the surrounding
Solution
The correct statement is A. The freezing point is lowered. When salt is dissolved in water, it disrupts the ability of the water molecules to form ice crystals, which is what happens when water freezes. This disruption causes the freezing point of the water to decrease. This is why salt is often spread on roads in winter - it lowers the freezing point of any water on the road, preventing it from turning into ice.
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