Is the solution after crystal precipitation an unsaturated solution?

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• 1. What is the crystallization process of unsaturated solution What is the process of crystal precipitation in unsaturated solution
• 2. Is it certain that crystals will precipitate from the unsaturated solution after a period of evaporation? Why?
• 3. To obtain salt crystals from a salt solution, the method can be A Decreasing temperature B Increase pressure C Evaporating solvent D Filtering
• 4. At 20°C, put 20g of sodium chloride into 100g of sodium chloride to prepare unsaturated solution. To saturate the solution, how many grams of sodium chloride need to be evaporated or how many sodium chloride crystals need to be added (The solubility of sodium chloride at 20.degree. C. is known to be 36 g At 20°C, put 20 g of sodium chloride into 100 g of sodium chloride to prepare an unsaturated solution. To saturate the solution, how many grams of sodium chloride need to be evaporated or how many sodium chloride crystals need to be added (The solubility of sodium chloride at 20.degree. C. is known to be 36 g
• 5. Evaporate the unsaturated solution until crystals begin to precipitate and stop heating. The resulting solution is As above. Saturated solution or unsaturated solution? Why? Evaporate the unsaturated solution until crystals begin to precipitate and stop heating. The resulting solution is As above. Saturated solution or unsaturated solution? Why? Why?
• 6. What is concentrated crystallization and what is the difference between concentrated crystallization and cooling, evaporative crystallization?
• 7. What is the difference between evaporative crystallization and evaporative concentration cooling crystallization filtration? What should I use to get crystals with crystalline water
• 8. Why filter after high-medium chemical evaporation concentration cooling crystallization? Mother liquor should be only water ~ and why wash? Doesn't the purified product dissolve after washing? Why ethanol? How does it dry in the end? The original topic is evaporative concentration while hot filtration cooling crystallization after why filtration! Why filter after high-medium chemical evaporation concentration cooling crystallization? Mother liquor should be only water ~ and why wash? Doesn't the purified product dissolve after washing? Why ethanol? How did it dry out? The original topic is evaporative concentration while hot filtration cooling crystallization after why filtration! Why filter after high-medium chemical evaporation concentration cooling crystallization? Mother liquor should be only water ~ and why wash? Doesn't the purified product dissolve after washing? Why ethanol? How does it dry in the end? The original problem is evaporative concentration while hot filtration cooling crystallization after why filtration!
• 9. Who tells me the difference and principle between evaporative concentration, cooling crystallization and evaporative concentration, hot filtration? The teacher said that "evaporative concentration, cooling crystallization" is used for substances whose solubility varies greatly with temperature, such as KNO3. But what is the principle of it? Who comes out and who stays in the solution? Why can "evaporative concentration, cooling crystallization" purify substances whose solubility varies greatly with temperature? Give me a detailed example. Also talk about evaporating and concentrating, filtering while hot A lot of wrong answers on the Internet ~ I hope you don't talk nonsense.
• 10. If the potassium nitrate solution contains a small amount of sodium chloride, it can be purified by evaporative crystallization 1. The remaining solution must be potassium nitrate solution 2. The remaining solution must be sodium chloride unsaturated solution 3. The above method can completely separate the two 4. Precipitated crystals contain only potassium nitrate If the potassium nitrate solution contains a small amount of sodium chloride, it can be purified by evaporative crystallization 1. The remaining solution must be potassium nitrate solution 2. The remaining solution must be sodium chloride unsaturated solution 3. The above method can completely separate the two. 4. Precipitated crystals contain only potassium nitrate
• 11. The cause of formation of fiber structure, banded structure and deformation texture during cold working and their influence on metal properties are briefly introduced
• 12. When to cool the crystallization and cool the hot saturated solution? When will it be crystallized by evaporation?
• 13. After evaporation of m g of water from the solution having a mass fraction of a solute, it becomes V ml of a sodium hydroxide unsaturated solution having a mass fraction of 2 a of solute What is the concentration of the substance obtained?
• 14. Which three types of common metal crystal lattice forms are there?
• 15. What is the difference between and recrystallization? The difference between cooling crystallization and recrystallization?
• 16. What instruments are used for evaporative concentration and cooling crystallization? Why? Why?
• 17. What is the number of electron number of manganese? What is the number of the outermost electrons in manganese?
• 18. What is the valence of the outermost 4 electrons Such as title
• 19. At 20°C, the solubility of salt is 36 g. At present,100 g and 200 g of saturated salt solution at 20°C are evaporated off 10 g of water at the same temperature. Algorithm Process and Text Analysis At 20°C, the solubility of salt is 36 salt is 36g. At present,100g and 200g of saturated salt solution at 20°C can evaporate 10g of water, and what are the precipitated crystals? To calculate the process and text analysis
• 20. At 20°C, the solubility of salt is 36 g. At this temperature, the mass fraction of solute in the saturated solution of salt