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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
20: X ==36:100
X ==55.6
Steam away 100-55.6=44.4g water
Or add 36-20=16 g of sodium chloride
Saturated
20: X ==36:100
X ==55.6
Steam off 100-55.6=44.4g water
Or add 36-20=16 g of sodium chloride
Saturated
Why does ammonium chloride precipitate after sodium chloride crystal is added to mother liquor ammonium chloride solution?
(1) NH3+H2O+CO2=NH4HCO3
(2) NH4HCO3+NaCl=NH4Cl+NaHCO3↓
Ammonia reacts with water and carbon dioxide to form one molecule of ammonium bicarbonate, which is the first step. The second step is to react ammonium bicarbonate with sodium halide to form one molecule of ammonium halide and sodium bicarbonate precipitation. Sodium bicarbonate precipitation is caused by its low solubility.
According to the principle that the solubility of NH4Cl at normal temperature is greater than that of NaCl, but at low temperature is less than that of NaCl, in 278K 283K (5 At 10°C), salt fine powder was added to the mother liquor, and NH4Cl was crystallized separately for nitrogen fertilizer.
Respondents: some_thing - CEO Level 14 12-19 09:25
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- 1. 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?
- 2. What is concentrated crystallization and what is the difference between concentrated crystallization and cooling, evaporative crystallization?
- 3. What is the difference between evaporative crystallization and evaporative concentration cooling crystallization filtration? What should I use to get crystals with crystalline water
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- 5. 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.
- 6. 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
- 7. 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~~
- 8. What does cooling crystallization purify?
- 9. 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?
- 10. 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
- 11. To obtain salt crystals from a salt solution, the method can be A Decreasing temperature B Increase pressure C Evaporating solvent D Filtering
- 12. Is it certain that crystals will precipitate from the unsaturated solution after a period of evaporation? Why?
- 13. What is the crystallization process of unsaturated solution What is the process of crystal precipitation in unsaturated solution
- 14. Is the solution after crystal precipitation an unsaturated solution?
- 15. The cause of formation of fiber structure, banded structure and deformation texture during cold working and their influence on metal properties are briefly introduced
- 16. When to cool the crystallization and cool the hot saturated solution? When will it be crystallized by evaporation?
- 17. 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?
- 18. Which three types of common metal crystal lattice forms are there?
- 19. What is the difference between and recrystallization? The difference between cooling crystallization and recrystallization?
- 20. What instruments are used for evaporative concentration and cooling crystallization? Why? Why?