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At 30°C,100g potassium nitrate saturated solution is respectively contained in beakers A and B. To precipitate potassium nitrate crystals of the same quality, the following methods are correct:() A. Evaporate 10 g of water each and return to original temperature B. Simultaneous cooling to a certain temperature C. Cup A evaporates 10 g of water, cup B evaporates 60 g of water and returns to the original temperature D. Simultaneous warming to a certain temperature
A.20g of water is evaporated and recovered to the original temperature. The quality of the evaporated water is the same, and the quality of the precipitated crystals is the same, so A is correct; B. At the same time, the temperature is reduced to a certain temperature, and the quality of the precipitated crystals is the same because the quality of the saturated solution is the same, so B is correct; C.10g of water is evaporated A, and 60g water is evaporated in cup B, and...
A.20g of water is evaporated and recovered to the original temperature. The quality of the evaporated water is the same and the quality of the precipitated crystals is the same, so A is correct; B. The temperature is reduced to a certain temperature at the same time. The quality of the precipitated crystals is the same because the quality of the saturated solution is the same, so B is correct; C.10g of water is evaporated in cup A,60g of water is evaporated in cup B, and...
In 30 degree centigrade,100 grams of potassium nitrate saturate solution is respectively contain in beakers A and B,
Evaporate the same mass of water; reduce the same temperature
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- 2. A certain amount of 14% by mass of KoH solution, if it is evaporated off 100 g of water, its mass fraction is 28% by volume, and the amount of the substance after concentration is? A certain amount of 14% by mass of KoH solution, if it is evaporated off 100 g of water, will have a mass fraction of 28% and a volume of 80 ml of concentrated substance in the amount of?
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- 4. At 20°C, the solubility of sodium chloride is 36 g/100 g of water. If 500 g of saturated sodium chloride solution at 20°C is evaporated off 100 g of water, the temperature is still reduced to 20°C. Mass fraction of solute in the remaining solution after precipitation of several sodium chloride crystals
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- 11. How many crystals of potassium nitrate precipitate when 93 g of potassium nitrate saturated solution is cooled to 10°C at 50°C?
- 12. At 20 degrees centigrade, the mass of the potassium nitrate saturated solution of the first and second beakers was 200 g and 300 g, respectively, and the mass of the precipitated crystals was the same under the following conditions: A, A and B solution cooling 5°C B. Solution A and B is cooled to 10°C C.20g of water is evaporated at constant temperature in solutions A and B 20 G of water and 30 g of water were evaporated from solutions D, A and B respectively At 20 degrees centigrade, the mass of the potassium nitrate saturated solution of the first and second beakers was 200 g and 300 g, respectively, and the mass of the precipitated crystals was the same under the following conditions: A, A and B solution cooling 5°C B. Solution A and B is cooled to 10°C C.20g of water is evaporated from both solutions at constant temperature 20G water and 30g water were evaporated from the solutions of D, A and B respectively At 20 degrees centigrade, the mass of the potassium nitrate saturated solution of the first and second beakers was 200 g and 300 g, respectively, and the same mass of the precipitated crystals obtained under the following conditions: A, A and B solution cooling 5°C B. Solution A and B is cooled to 10°C C.20g of water is evaporated at constant temperature in solutions A and B 20G water and 30g water were evaporated from the solutions of D, A and B respectively
- 13. At present,81.95g potassium nitrate saturated solution at 40°C, and how many g potassium nitrate crystals precipitate at 10°C? (The solubility of potassium nitrate is known to be 63.9 g at 40°C and 20.9 g at 10°C
- 14. At present,210 g of potassium nitrate saturated solution at 60°C is used. If the temperature drops to 20°C, how much g of potassium nitrate crystal is precipitated Solubility of potassium nitrate at 60 g at 60°C and 31.6 g at 20°C At present,210g of potassium nitrate saturated solution at 60°C is used. If the temperature drops to 20°C, what is the mass of potassium nitrate crystal Solubility of potassium nitrate is 110 g at 60°C and 31.6 g at 20°C
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- 17. At 60 degrees Celsius, the solubility of sodium chloride is 37 g, and 100 g of a saturated solution of sodium chloride at 60 degrees Celsius is now heated to evaporate 20 g of water How many grams of crystal can be precipitated _
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- 20. After a bottle of 14% potassium hydroxide solution was heated and evaporated off 100 g of water,80 mL of 28% potassium hydroxide solution was obtained at a concentration of () A.5 mol/L B.6 mol/L C.6.25mol /L D.6.5mol/L