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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!
Preconditions: evaporation, concentration, cooling, crystallization (recrystallization), the purpose is to remove impurities, i.e. use solvent to completely dissolve the impure substance, and then make the desired substance reach supersaturation by cooling and reducing the solvent to crystallize (precipitate) from the solution. The purity of the crystalline substance is generally higher than that of the substance before recrystallization, and...
Preconditions: evaporative concentration cooling crystallization (recrystallization) aims to remove impurities, is to remove impurities, i.e. use solvent to completely dissolve the impure substance, and then make the desired substance reach supersaturation by cooling and reducing the solvent to crystallize (precipitate) from the solution. The purity of the crystalline substance is generally higher than that of the substance before recrystallization, and...
Preconditions: evaporative concentration cooling crystallization (recrystallization) aims to remove impurities, is to remove impurities, i.e. use solvent to completely dissolve the impure substances, and then make the substances we want to achieve supersaturation by cooling and reducing the, so as to crystallize (precipitate) from the solution. The purity of the crystalline substances is generally higher than that of the substances before recrystallization, and...
High-medium cool crystallization evaporation crystallization Crystallization cooling, what are the main substances What substance is evaporative crystallization? Examples High-medium cool crystallization evaporation crystallization Crystallization cooling, what are the main substances What is the main substance of evaporative crystallization? Examples
Cooling crystallization mainly includes condensation caused by low temperature such as ice and carbon dioxide
Evaporative crystallization is mainly caused by cold and hot air collision to form small water droplets and so on
Cooling crystallization mainly includes condensation caused by low temperature such as ice and carbon dioxide
Evaporative crystallization is mainly caused by the collision of cold and hot air to form small water droplets and so on
RELATED INFORMATIONS
- 1. 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.
- 2. 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
- 3. 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~~
- 4. What does cooling crystallization purify?
- 5. 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?
- 6. 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
- 7. Will the solubility of the substance change while the solvent is being evaporated?
- 8. 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
- 9. What is the characteristic of the solubility of various solid substances affected by temperature?
- 10. 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?
- 11. What is the difference between evaporative crystallization and evaporative concentration cooling crystallization filtration? What should I use to get crystals with crystalline water
- 12. What is concentrated crystallization and what is the difference between concentrated crystallization and cooling, evaporative crystallization?
- 13. 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?
- 14. 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
- 15. To obtain salt crystals from a salt solution, the method can be A Decreasing temperature B Increase pressure C Evaporating solvent D Filtering
- 16. Is it certain that crystals will precipitate from the unsaturated solution after a period of evaporation? Why?
- 17. What is the crystallization process of unsaturated solution What is the process of crystal precipitation in unsaturated solution
- 18. Is the solution after crystal precipitation an unsaturated solution?
- 19. The cause of formation of fiber structure, banded structure and deformation texture during cold working and their influence on metal properties are briefly introduced
- 20. When to cool the crystallization and cool the hot saturated solution? When will it be crystallized by evaporation?