Usually expressed in terms of mass fraction or molar concentration. Salt solubility is an important index of substance solubility in water, which has important theoretical and practical significance for chemical reaction, environmental science, biological science and other fields.
The degree of salt dissolution depends on the interaction between substance and water, including van der Waals force, hydrogen bond and so on. The salt solubility of different substances is very different, such as sucrose, sodium chloride and other substances have good solubility in water, while charcoal, iron oxide and other substances have poor solubility in water.
Salt-soluble application
1, salt water planting: In agriculture, salt solution can be used for salt water planting. Saline planting is a method of planting crops in high salinity soil, which can help crops resist environmental pressures such as salt and drought. By dissolving salt in water, it can provide necessary nutrition for crops.
2. Salt bath: In the field of health care, salt solution can be used for salt bath. Salt bath is to dissolve salt in water and then soak the body in salt water to achieve the purpose of relieving fatigue and muscle pain. Salt in salt bath helps to eliminate bacteria and toxins on the skin and promote skin health.
3. Salt roasting: In the field of cooking, salt-soluble application can be used for salt roasting. Salt baking is a method of wrapping food with salt, then heating at high temperature to dissolve the salt and cook the food. Roasting salt can keep the moisture and taste of food, and at the same time give food a special taste.
4. Salt water cleaning: In daily life, salt solution can be used for cleaning. Dissolving salt in water can produce a certain concentration, which is helpful to remove oil stains and other substances that are difficult to clean. Salt water cleaning can be used for kitchen utensils, clothes, skin and other occasions.
5. Brine culture: In the fishery field, salt solution can be used for brine culture. Salt water culture is a method to cultivate aquatic animals such as fish and shrimp in high salinity water. Salt water can provide some protection for aquatic animals and help them resist the invasion of germs and parasites.
6. Saline injection: In the medical field, the application of salt dissolution can be used for saline injection. Saline injection is a method of dissolving salt in water and then injecting saline into human body through syringe to achieve the purpose of treatment. Injection of normal saline can be used to relieve pain and replenish water and electrolytes.
Key points of scientific research on salt dissolution
1. Solubility of salt in aqueous solution: Study the solubility of salt in aqueous solution at different temperatures, pressures and concentrations, and understand the relationship between solubility and solution conditions. Solubility data is of great significance to practical engineering applications, such as chemical industry, metallurgy, food, medicine and other fields. It is necessary to control the concentration of salt in the solution to ensure the normal production process.
2. Acidity and alkalinity of solution: Ions generated by salt ionization in aqueous solution will affect the acidity and alkalinity of solution. Studying the acid-base equilibrium system formed by different salts in water is helpful to understand the acidity and alkalinity and related properties of the solution.
3. ionic strength: ionic strength is a measure of the influence of ionic concentration in the solution on the properties of the solution. Ionization of salt in solution produces ions, which increases the ionic strength of the solution. The ionic strength has an important influence on the viscosity and conductivity of the solution.
4. Salt effect: The phenomenon that salt reacts with other substances in solution is called salt effect. Salt effect will affect the solubility and reaction rate of substances in solution. Studying the salt effect is helpful to understand the mechanism of chemical reaction in solution.
5. Application: Salt dissolution science is of great significance in practical applications, such as wastewater treatment, metal extraction, drug research and development, etc. In order to improve the production efficiency and product quality, it is necessary to optimize the technological process by using the scientific principle of salt dissolution.