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What causes the temperature to go down after adding salt to ice water?
Wiki User
∙ 14y ago
Let's assume a couple things: the ice is colder than 32°F (an acceptable premise) and that adding salt to water lowers its freezing point (a widely-known phenomenon).
A property of melting/freezing, as well as of boiling/condensing, is that no further temperature change can occur until all of the substance has changed phase.* If you assume that the water in the cup is uniformly at 32°F when we begin, it will be 32°F until all the ice is gone, then begin warming to room temperature.
If you add salt to water while the ice is still melting, you lower the freezing point of the water. This is known as fusion curve depression. The ice begins to melt faster because the liquid is no longer at the freezing point. Since our premise says the ice is colder than freezing, the overall temperature of the water will be less than 32°F as soon as salt is added.
* Exceptions - superheated and supercooled substances, which are only possible in strictly controlled conditionsWiki User
∙ 14y ago
Wiki User
∙ 14y agoBecause it made the ice melt as salt water has a lower freezing point than ordinary water. The melting process takes "latent heat of melting" out of the mixture and causes the temperature to drop.
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Adding water can often slow down a chemical reaction by diluting it. This is the case of a quantitative reaction such as an enzymatic reaction.
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