What Water Will Freeze First? Tap, Salt, Or Sugar?

35 Answers

Jeromeproofer Penn Profile
The first liquid to freeze will be the unadulterated tap water, followed by the sugar water and finally, the salted water.

The reason for this is that when you add a solute (a substance dissolved in another substance, usually the component of a solution present in the lesser amount) to water, it lowers its freezing point. Therefore in order to freeze the impure water you need to lower its temperature to a greater extent than in normal circumstances. This is called "freezing point depression". It is a "colligative property" of water.

The reason why tap water freezes first is that tap water does not contain any large amounts of minerals, chemicals or solutes, so there are less solute particles to depress the freezing points. Therefore the freezing point will be reached at a higher temperature than a water solute (this is 0° Celsius/ 32° Fahrenheit). The sugar molecules will depress the water freezing point further. If you have added 1 molecule of sugar to water, the water will freeze later (at -1.8° C/ 28.76° Fahrenheit). In the case of the salt water, one molecule contains two elements - Sodium (Na) and Chloride (Cl). When you add 1 molecule of salt into water, two ions (1 molecule of Na+ and 1 molecule of Cl-) are present in the water. This means there are more molecules of solute to depress the freezing point to an even further extent than the sugar's 1 molecule. This water solution will freeze at -13.6° Celsius (7.52° Fahrenheit).

The phenomenon is best observed in sea water, which due to its heavy salt content remains liquid at temperatures well below 0°C (32°F), the freezing point of pure water.
ray of light Profile
ray of light answered
The tap water will freeze first, then the sugar water, and the salty water will freeze at the end. In fact, when you add a solute to water, it lowers its freezing point. So you have to lower down the temperature to freeze the water. This is called as "freezing point depression". It is "colligative property" of water. The reason why tap water freezes first is that, tap water does not contain minerals/chemicals/solutes in heavy quantity. So there are less solute particles to depress the freezing points, so the freezing point will reach earlier (at little lower than 0 degree Centigrade). But then sugar molecules will depress the water freezing point even further. So if you have added 1 mole of sugar to water, the water will freeze later (at -1.8C). In the case of salt,one molecule contains two ions i.e Na+ and Cl-. So when you add 1 mole of salt in water, two moles of ions (1 mole of Na+ and 1 mole of Cl-) are present in the water. So there are more molecules of solute to depress the freezing point more than the sugar's 1 mole does. So the water will freeze at -13.6C.  I hope you got the whole idea about freezing point depression:)
Anonymous Profile
Anonymous answered
The salt water will freeze after the sugar water. This is because salt is made up of two components, Na+ and Cl-. Sugar only has one molecule to depress the freezing point. Therefore, salt takes more time to reach its freezing point. It also means that salt water's freezing point is lower.

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Anonymous Profile
Anonymous answered
I have an answer. I am doing the same experiment as you. The tap will freeze faster then the sugar and the salt freezes last. The salt freezes last because you know the ocean is salt water and that never freezes, so that is the same as the salt water that you are testing.
Anonymous Profile
Anonymous answered
I think that regular water would freeze faster because if you freeze both of them at the same time water would freeze faster and sugar water would not go as fast as the water did because of the particles in the sugar water slowed it down it has the ingredients which blocks the freezing rays causing it to take longer therefor water would freeze faster.
amber Jhon Profile
amber Jhon answered
Freezing of any solvent is a colligative property. Colligative properties are those that depend upon the amount of solute added to the solvent. When we talk about pure water its freezing point will be 0 degree Celsius. But when sugar is added to the pure water the freezing point changes Now it is a solution of water and sugar and the extent of change depends upon the amount of sugar that solution contains. The affect produced is that the freezing point of sugar water is depressed means lowered. This will freeze at lower temperature than the pure water. So pure water will freeze faster.
Anonymous Profile
Anonymous answered
Because when you add salt to water it lowers the freezing point
Anonymous Profile
Anonymous answered
Water will freeze faster since salt lowers the freezing temperature of water. Hence it will take longer for the salt water to reach freezing temperature than the fresh water.
Anonymous Profile
Anonymous answered
I think that water will freeze faster because it doesn't have anything in it. It's just clear water
Anonymous Profile
Anonymous answered
When I put plain water out for outside cats in cold weather, it freezes within an hour or two. When I put a little sugar in the water, the water stays liquid for a longer time, to couple of hours.
Anonymous Profile
Anonymous answered
The tap because salt is used to melt ice on roads and because the sugar water has a lower freezing point.
Anonymous Profile
Anonymous answered
Water freezes faster...
Because..uhhmmm..
Well lets just say that water are lakes..
And salt water is an ocean.
Lakess(water) freeze during the winter..
And oceans(salt water) does not..
:D
chhheeeaaasssee//
:]
Anonymous Profile
Anonymous answered
Nwk I really don't care about which freezes faster. Ok I think water because it sometimes freezes fast so I guess sugar water might lose.But like I said I don't care. P.S. Nwk means Nikka who knows.

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