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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
Mass fraction of saturated solution at 40%=63.9/163.9=38.99%
Potassium nitrate in original solution 81.95*38.99=31.95g
Water 81.95-31.95=50g
50 G of water can dissolve 10.45 g of potassium nitrate at 10°C
Mass of potassium nitrate precipitated 31.95-10.45=21.5 g
210G of saturated potassium nitrate solution with temperature of 60°C, and how many grams of potassium nitrate crystals are precipitated if the temperature is lowered to 20°C Solubility of potassium nitrate at 60°C is 110g, solubility of potassium nitrate at 20°C is 31.6g, I would like to know how to find amount of potassium nitrate solute g 210G of saturated solution of potassium nitrate at 60°C, how many grams of potassium nitrate crystals are precipitated if the temperature is lowered by 20°C Solubility of potassium nitrate at 60°C is 110g, solubility of potassium nitrate at 20°C is 31.6g, I would like to know how to find amount of potassium nitrate solute g
Solubility of potassium nitrate at 60°C is 110 g
That is,100 g of water can dissolve 110 g of KNO3 at 60°C
Total mass of solution is 210g
Indicate 100 g of water
Solubility of potassium nitrate at 20°C is 31.6 g
That is,31.6 g of KNO3 can be dissolved in 100 g of water
Excess 110-31.6=78.4gK NO3 precipitated
RELATED INFORMATIONS
- 1. 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
- 2. How many crystals of potassium nitrate precipitate when 93 g of potassium nitrate saturated solution is cooled to 10°C at 50°C?
- 3. 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
- 4. After evaporation of mg water from the KOH solution with a mass fraction of W, the mass fraction became exactly 3 W and the volume was VL (no crystal precipitation in the solution) The mass concentration of the concentrated solution is? Use a comprehensive expression to express it, not to count. After evaporation of mg water from the KOH solution with a mass fraction of W, the mass fraction becomes exactly 3 W and the volume is VL (no crystal precipitation in the solution) The mass concentration of the concentrated solution is? Use a comprehensive expression to express it, not to count.
- 5. 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?
- 6. Q: If a certain amount of 14% potassium hydroxide solution is evaporated from 100 g of water, its mass is 28% and its volume is 125 ml, then what is the concentration of KOH after concentration? I have an answer.(I'd better be taught how to analyze and solve problems.) Thank you! Q: If a certain amount of 14% potassium hydroxide solution is evaporated from 100 g of water, its mass is 28% and its volume is 125 ml, then what is the concentration of concentrated KOH substance? I have the answer.(It's better to teach me how to analyze the problem.) Thank you!
- 7. 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
- 8. 4.20°C, the solubility of NaC1 is 36g, what is the mass fraction of saturated sodium chloride solution at this temperature? 4. What is the mass fraction of is 36g at 20°C, what is the mass fraction of saturated sodium chloride solution at this temperature?
- 9. At t.degree. C.,200 g of a solution is evaporated,20 g of water is evaporated,8 g of crystal is precipitated, and 20 g of water is evaporated, and 12 g of crystal is precipitated. The solubility of a substance at t.degree. C. is () A.40 g B.50 g C.60 g D.100 g
- 10. At 20°C, the solubility of salt is 36 g. At this temperature, the mass fraction of solute in the saturated solution of salt
- 11. 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
- 12. It is known that 20.d egree. is the understanding of the saturated solution of nacl at a temperature where the solubility of nacl is 36 g Talk about the understanding of the saturated solution of nacl at this temperature 2 How to configure the saturated solution at this temperature?
- 13. When the solubility of sodium chloride is 36G at 20°C, what is the mass fraction of fraction of saturated solution of 100G sodium chloride at this temperature? When the solubility of sodium chloride is 36G at 20°C, what is the solute mass fraction of saturated solution of 100G sodium chloride at this temperature?
- 14. 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 _
- 15. Solubility of sodium chloride at 20° is 36.0g/100g water. To prepare saturated solution of sodium chloride at 20°, please answer: ) How many grams of water does 18 g of sodium chloride need to be dissolved? (2) What is the maximum amount of sodium chloride that can be dissolved in 150g water? (3) How much g of sodium chloride and water is required to prepare 500 g of saturated sodium chloride solution? (To the nearest 1g) I'm gon na take a step.- Give it to me by 10:00 tonight. It's overdue.
- 16. At 20.degree. C., there are two saturated sodium chloride solutions, also 200 g and 100 g in mass, each evaporating 11 g of water at 20.degree. C. The precipitated crystals are two g of A and B, then A and B (greater than, equal to, and less than At 20.degree. C., there are two saturated sodium chloride solutions, also 200 g and 100 g in mass, each evaporating 11 g of water at 20.degree. C., and the precipitated crystals are two g of A and B, then A and B (greater than, equal to, and less than
- 17. 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
- 18. A bottle of 14% KOH solution was heated and evaporated off 100 g of water to 80 mL of 28% KOH solution with an amount-concentration of () A.5 mol•L-1 B.6 mol•L-1 C.6.25 mol • L-1 D.6.75 mol • L-1 A bottle of 14% KOH solution was heated and evaporated off 100 g of water to 80 mL of 28% KOH solution in an amount of () A.5 mol•L-1 B.6 mol•L-1 C.6.25 mol • L-1 D.6.75 mol • L-1
- 19. 14% Of the koH solution is heated to evaporate 100 g to 80 ml of the 28% of the koH solution. What is the mass concentration of this 80 ml solution? 14% Of the koH solution is heated and evaporated 100 g to 80 ml of the 28% of the koH solution. What is the mass concentration of this 80 ml solution?
- 20. After evaporating 100 g of water from 14% KOH solution,80 mL of 28% KOH solution was obtained, and the mass concentration of this solution was ______.