Question

How impurities affect the freezing point of a liquid​

Answer 1

Answer:

The presence of impurities lowers (depresses) the freezing point of a liquid. The impurities lower the vapour pressure of the solution so that ice can melt at a lower temperature.We've all been taught that water freezes at 32 degrees Fahrenheit, 0 degrees Celsius, 273.15 Kelvin. That's not always the case, though. Scientists have found liquid water as cold as -40 degrees F in clouds and even cooled water down to -42 degrees F in the lab.

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Answer 2

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Explanation:

The presence of impurities lowers (depresses) the freezing point of a liquid.

The impurities lower the vapour pressure of the solution so that ice can melt at a lower temperature.

Note that the ice and solution curves intersect (see the dark blue circle on the diagram) at a lower temperature than the ice and water curves (see the light blue circle on the diagram).

Sea water freezes at about -2°C, compared to 0°C for pure water.

Sodium chloride (usually in the form of rock salt) is sprinkled on roads during the Winter to depress the freezing point of water and reduce the likelihood of water freezing to form ice.