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The salt is not actually making the ice colder. The internal portions of the ice are already below 0 degrees Celsius. The salt, or NaCl, gets in the way of the intermolecular forces of the water, allowing the ice to melt at lower temperatures and remain in the water phase below 0. In other words, the water molecules are normally rigid enough to freeze at 0 degrees, but the addition of salt makes it more difficult for them to be rigid enough. This lowers the melting point. As the internal portions of the ice are already below 0, when the external ice is melted below 0 also, the internal, very cold portions, can further cool the water/ice mixture. The above answer is easily disproven. The assertion is that the ice core is colder than the surface, and the warmer surface is just being stripped away by the salt, revealing the cooler inner core.To disprove that, do the following experiment: Measure the temperature of your freezer. If your ice has been in there any length of time, the core and surface of the ice will be at the same temperature that you have measured (e.g. 25 F). Take a pile of ice from your freezer, dump a pile of salt on it, stir (for a while), and measure the temperature with a thermometer. It will get WAY colder than your freezer, thus proving the original answer to be impossible.
REAL ANSWER:
Once salt comes into contact with water, NaCl would split into Na(+) and Cl(-). Since these atoms have charges, they "tug" at individual water molecules. This makes the water less rigid and separate from each other. Since they are less rigid, the water molecules are free to move around. This movement is kinetic energy, which is measured by temperature. Due to the law of conservation of energy, the kinetic energy of the water can't just appear, it has to come from it's surroundings. So the air and objects near the ice/salt solution would transfer their heat to the ice/salt.
More powerful salt, like CaCl2 works better than regular salt because when it touches water, it splits into three atoms: Ca(+2), Cl(-), and Cl(-). The extra atoms mean more force when they "tug" at water molecules.
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoSalt release slowly the heat of dissolution and the temperature is increased.
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Why do you use rock salt in ice-cream?
You don't use rock salt in ice cream, unless you want salty ice cream. You use rock salt (though table salt or sea salt would work just about as well) in the freezer to get it colder than you could with a mixture of ice and water.
Why ice don't melt in table salt?
It is because when you put in table salt, actually any salt, the ice absorbs the salt's energy and that is what make the ice colder than it was.
Can salt have an effect on the taste of ice cream?
Well, it does make it salty. In all seriousness though, if you add rock salt while making home made ice cream, it doesn't affect the flavor, but it makes it colder.
Is salt water colder then ice?
well for something to freeze it has to be 0 degrees or lower which is what ice is, frozen water. so the water has to be 1 degree or more to NOT freeze so the ice is colder than salt watercoz salt water is not frozen... does t6hat make sense? Actually, salt water CAN be colder than ice because the salt lowers the freezing point of the water.
Can you use salt instead of rock salt to make homemade ice cream?
No.
What does adding salt do to making homemade ice cream?
Add salt to the ice to make it colder.
Why is salt added to ice?
To make it colder, faster.
Why do the ice cream vendors add plenty of rock salt in the surrounding ice cube at the ice cream container?
Because the salt makes it colder
Why do you use rock salt in ice-cream?
You don't use rock salt in ice cream, unless you want salty ice cream. You use rock salt (though table salt or sea salt would work just about as well) in the freezer to get it colder than you could with a mixture of ice and water.
Why ice don't melt in table salt?
It is because when you put in table salt, actually any salt, the ice absorbs the salt's energy and that is what make the ice colder than it was.
Can salt have an effect on the taste of ice cream?
Well, it does make it salty. In all seriousness though, if you add rock salt while making home made ice cream, it doesn't affect the flavor, but it makes it colder.
Are you saying that table salt will not work when making homemade ice cream and is there another substitute?
Table salt (mixed with the ice) works just fine to freeze the ice cream mixture. There are other salts that can make the temperature colder, but they are not necessary and are usually more expensive than table salt. "Rock salt" is large grained version of table salt, it will usually keep the mixture cold a bit linger, but it will not be colder.
Is salt water colder then ice?
well for something to freeze it has to be 0 degrees or lower which is what ice is, frozen water. so the water has to be 1 degree or more to NOT freeze so the ice is colder than salt watercoz salt water is not frozen... does t6hat make sense? Actually, salt water CAN be colder than ice because the salt lowers the freezing point of the water.
Can you use salt instead of rock salt to make homemade ice cream?
No.
Why should you use rock salt rather than regular table salt to make homemade ice cream?
Table salt has more artificial chemicals then natural rock salt. This really has nothing to do with it since the salt is never in contact with the ice cream. While rock salt is ideal, you can use table salt if needed. You can also make your own rock salt by heating some water, then dissolving as much salt in it as allowed. Heat the water until boiled. When the boiling water has become a saturated solution and cannot dissolve any more salt, remove the water from the stove and let it cool. As the water evaporates from the solution, the salt will form crystals. You can then crush the crystals, and you've got rock salt. It is usually preferable to use rock salt, because table salt is a finer grain. It dissolves quicker and effects the brine. The brine pulls heat from the batter. If the salt dissolves in the brine too quickly, it will drop the temperature of the batter too quickly. This will cause ice crystals to form in the ice cream, and a gritty texture may occur.
Can rock salt be eaten?
You can eat rock salt but it is in a crude form. It won't hurt you and is generally used to make ice cream and to melt ice on sidewalks.
Is rock salt beneficial for blood pressure?
No. Rock salt is used to make ice cream and melt ice on roads. Regular salt is not good for blood pressure because it will raise it.
