After adding sugar or salt to water, the density of the solution will increase accordingly, and the freezing point of the liquid is related to the density. As the density increases, the freezing point will decrease, hence freezing. The point in the water will increase accordingly. It is not easy to freeze after adding sugar and salt. It will always freeze when the temperature is below the freezing point of the solution.
In winter, you can sprinkle salt on melted ice and snow to turn it into salt water and prevent it from freezing again. Because the freezing point of salt water is lower than that of water, for example: the freezing point of sea water is about -2.3°C, it is not easy for salt water to solidify and allow ice and snow to melt.
If there is no salt, the room temperature will be very difficult to melt even if it is above 0 degrees. A foIf the salt is sprinkled, condensation nuclei will be provided and the temperature will begin to melt slightly above. 0 degrees. Additionally, the melting point of salt water solution is medium. Both are below 0 degrees. The combination of the two factors makes it easier for the snow to melt by spreading the salt. (If the solution contains 20% salt, its freezing point will be reduced to -16°C. Taking advantage of the low freezing point of salt, salt can be used to prevent highway sidewalks and airport runways from freezing in the cold winter.)< /p>
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When there is dust or dirt in your house, pour a little salt water on the dirty area to achieve the sterilization effect. The principle is to use the osmotic pressure of salt water. to make bacteria lose water. Additionally, if you aspPlace a little salt water in the corners of your house during general cleaning, you can also prevent the invasion of cockroaches and other mosquitoes. This eliminates the need to purchase pesticides and appears to have the effect of preventing global warming.
If you use salt water to rinse your mouth, you can remove the odor in your mouth and achieve a cleansing effect. It is said that drinking a glass of salt water when experiencing gastrointestinal discomfort can eliminate gastric acid in the stomach and achieve acid-base neutralization. In fact, salt water may dilute stomach acid rather than neutralize it, because the salt in salt water is primarily neutral sodium chloride. Salt water can also conduct electricity, while regular water and distilled water cannot.
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One cup of pure water and one cup of sucrose water are placed in a sealed container. This will happen after a long enough time. ? Be sure to explain why.
Solution: Add rock candy to the water. Both water and candy sugar are substances made up of molecules. Since there is some space between the molecules that make them up, when the two substances are mixed and dissolved, the molecules intercalate with each other and move in the space between the molecules. Therefore, after mixing and completely dissolving to form a solution, the volume will be less than the sum of the two volumes, therefore the liquid level will decrease.
So the answer is: since there are spaces between the molecules that make up water and rock sugar, they pass each other when dissolving, so after being completely dissolved, the volume will be less than the sum of the two volumes, so the liquid level will decrease.
Pure water will evaporate completely. According to the colligative properties of the solution, the saturated vapor pressure of sucrose solution is always lower than that of pure water, and pure water will continue to evaporate.
Sugar is a crystal, meaning there is a fixed distance between the molecules. Water molecules also have sizes (unlike sugar). Evaporation, volatilization, etc. are ignored because they are placed in the same airtight bell.
The water level in pure water decreases and the water level in sugar water increases. According to the colligative properties of the solution, the saturated vapor pressure of different solutions is different, and there is a dynamic transformation process to reach a new equilibrium state in the same system.
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At a certain temperature, acertain substance in 100 g of solvent achieved The number of grams dissolved in the saturated state (or dissolution equilibrium) is called solubility of that substance in that solvent. At a certain temperature and pressure, the maximum amount of a substance dissolved in a certain amount of solvent is called the solubility of that substance in that solvent.
Solubility refers to the ability of a substance to dissolve in another substance. It is usually expressed by approximate concepts such as easily soluble, soluble, slightly soluble, poorly soluble or insoluble. Solubility is a measure of the solubility of a substance in a solvent and is a quantitative expression of solubility.
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