How to use salt to freeze water quickly, how to use salt to freeze water quickly

Good evening, if there is enough potassium nitrate.

or ammonium chloride.

After being dissolved in water, it can absorb a large amount of heat for a period of time, and after a period of time, a certain capacity of aqueous solution will reach zero degrees and freeze, which is also one of the basic raw materials of saltpeter ice-making method commonly used in ancient China, please refer to it. Other inorganic salts such as ammonium bromide and ammonium nitrate can also absorb heat in large quantities.

When possible, you can also try to make artificial ice coolant.

Salt does not freeze water quickly, salt can quickly turn ice into water. Snow removal and salt sprinkling embodies the three physical and chemical properties of table salt:

1. Solubility: instant salt is easily dissolved in water.

2. Moisture absorption: there is a thin film solution on the surface of salt, and when its vapor pressure is lower than the water vapor partial pressure in the air, the salt will adsorb the moisture in the air and deliquescent.

3. Low freezing point: The freezing point of the saline solution is low. If the salt solution contains 20% salt, its freezing point will drop to -16.

Benefits of Eating Salt:

1. Maintaining the osmotic pressure of extracellular fluid, salt plays an important role in maintaining osmotic pressure and affects the movement of water in the human body.

2. Participate in the regulation of acid-base balance in the body.

3. Chloride ions are involved in the production of gastric acid in the body.

4. Salt also plays a role in maintaining the normal excitability of nerves and muscles.

5. It has the effects of clearing fire and detoxifying, cooling blood and nourishing kidneys, and laxative.

6. Salt has strong penetration, which can relieve greasyness, remove fat and fish, and maintain the original taste of food, making food easy to digest.

All you need is a lighter, a straw, a glass of water and some salt. It's also very simple, sprinkle some salt into the water first, then seal one end of the straw with your finger, burn the other end of the straw with a lighter, then quickly insert the straw into the water, then let go of your fingers, and after 5 seconds, quickly pull the straw out of the water, so that the water in the cup will freeze in a few seconds.

When doing water freezing experiments, adding more salt to the crushed ice is to quickly absorb heat and freeze quickly.

When the ice salts are mixed together, two effects will occur at the same time: one is to greatly accelerate the melting speed of the ice, and when the ice melts, it will absorb a lot of heat; The other is the dissolution of salt, which also absorbs the heat of dissolution. Therefore, it can absorb a large amount of heat in a short period of time, so that the temperature of the ice-salt mixture drops rapidly, and it is much lower than the temperature of ice alone.

The temperature of the ice-salt mixture is based on the percentage of salt mixed into the ice.

And decided, such as the amount of salt used in ice, the minimum temperature can reach -21.

Ice salt bath:

The cooling principle of the ice salt bath and the freezing point of the solution.

Decline. When salt and ice are evenly mixed together, the ice melts slightly into water due to the absorption of environmental heat, and the salt dissolves when it meets water, so that the surface water forms a concentrated salt solution.

Since the freezing point of the concentrated salt solution is lower than that of pure water, and the system is where the concentrated salt solution and ice coexist, the temperature of the system must drop to maintain this coexistence (the coexistence temperature of the concentrated salt solution and ice should be lower than that of pure water). This will cause more ice to melt into water to dilute the concentrated salt solution, reducing the temperature of the system due to a large amount of endothermy during the melting process.

Salt accelerates the melting of ice and absorbs heat quickly, so the water freezes.

This is the reason why seawater is salt-dissolved water, and the temperature of seawater freezing in winter is lower than that of river water. The melting point of saturated salt water can drop to about -22, and the northern cities often sprinkle salt on the snow on the road when it snows heavily in winter, as long as the temperature is higher than -22 at this time, enough salt can always melt the ice and snow, which is also an application of the melting point in daily life.

Icing to sprinkle salt can reduce the freezing point of water, the melting point of any aqueous solution is lower than the same situation, the melting point of water is lower, the anti-slip effect of salt itself is not obvious, and the salt is sprinkled when it snows because the freezing point of salt water is lower than that of pure water. And the higher the concentration of brine, the lower the freezing point.

The snow melts away more quickly, thus having a non-slip effect, just as the freezing point of seawater is lower than that of pure water, and the sprinkling of salt makes the water denser, so that it is not easy to freeze, and the water runs away or evaporates. When water is to freeze, when chloride and potassium ions are present, chloride ions and potassium ions will destroy the crystalline network structure of water, so that the water cannot freeze.