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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.
"Evaporative concentration, cooling crystallization" is used for substances with large solubility with temperature, such as KNO3. Evaporative concentration forms saturated solution of substances with large solubility with temperature, such as potassium nitrate. When cooling, solubility of substances with large solubility with temperature decreases obviously, solute will crystallize and precipitate." Evaporative concentration, while hot...
Why is it that potassium nitrate impurity in sodium chloride is crystallized by evaporation solvent, and sodium chloride mixed in potassium nitrate is saturated by cooling heat?
Because the solubility of potassium nitrate increases rapidly with increasing temperature.
Solubility of sodium chloride increases slowly with increasing temperature.
RELATED INFORMATIONS
- 1. 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
- 2. The potassium nitrate solution is mixed with sodium chloride and purified by evaporation, crystallization and hot filtration, right? Why? Thank you. What is recrystallization? Xie~~
- 3. What does cooling crystallization purify?
- 4. Why the potassium nitrate solution contains a small amount of sodium chloride should be purified by cooling crystallization method Why not use evaporative solvents? Is sodium chloride or potassium nitrate separated out? After meeting the question about purification, what kind of separation is it?
- 5. How to purify potassium nitrate if potassium nitrate contains a small amount of sodium chloride (1 dissolution 2 filtration 3 cooling crystallization 4 heating and concentration) and explain the principle
- 6. Will the solubility of the substance change while the solvent is being evaporated?
- 7. What is the relationship between the solubility curve and evaporation crystallization or cooling crystallization? Is, for example, a solubility that increases with temperature Many, the other little change, this and other types of what crystal removal methods are needed
- 8. What is the characteristic of the solubility of various solid substances affected by temperature?
- 9. Why does the solubility of a gas solid vary with temperature, since it diffuses uniformly in molecular or ionic form after dissolution? Should we consider micro rather than macro at this point? Why does the solubility of a gas solid vary with temperature, since it diffuses uniformly in molecular or ionic form after dissolution? Should microcosmic, not macrocosmic, be considered at this point?
- 10. At t.degree. C.,500 g of potassium nitrate solution,40 g of water evaporated,20 g of crystals precipitated, and 40 g of crystals precipitated after further evaporation of 40 g of water How much is the solubility at this temperature?
- 11. 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!
- 12. What is the difference between evaporative crystallization and evaporative concentration cooling crystallization filtration? What should I use to get crystals with crystalline water
- 13. What is concentrated crystallization and what is the difference between concentrated crystallization and cooling, evaporative crystallization?
- 14. 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?
- 15. 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
- 16. To obtain salt crystals from a salt solution, the method can be A Decreasing temperature B Increase pressure C Evaporating solvent D Filtering
- 17. Is it certain that crystals will precipitate from the unsaturated solution after a period of evaporation? Why?
- 18. What is the crystallization process of unsaturated solution What is the process of crystal precipitation in unsaturated solution
- 19. Is the solution after crystal precipitation an unsaturated solution?
- 20. The cause of formation of fiber structure, banded structure and deformation texture during cold working and their influence on metal properties are briefly introduced