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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?
1. Saturated solution meets two conditions:36g NaCl in 100ml saturated solution
2. Add excess NaCl to the solution and filter out the saturated solution
What is metal cold working?
It usually refers to the cutting of metal. The cutting tool (including tool, abrasive and abrasive) is used to cut the blank or the surplus material layer on the workpiece into chips, so that the workpiece can obtain the specified geometry, size and surface quality. Any cutting must meet three basic conditions: cutting tool, workpiece and cutting operation.
It usually refers to the cutting of metal. The cutting tool (including tool, abrasive and abrasive) is used to cut the blank or the excess material layer on the workpiece into chips, so that the workpiece can obtain the specified geometry, size and surface quality. Any cutting must have three basic conditions: cutting tool, workpiece and cutting operation.
RELATED INFORMATIONS
- 1. 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
- 2. 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
- 3. 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
- 4. How many crystals of potassium nitrate precipitate when 93 g of potassium nitrate saturated solution is cooled to 10°C at 50°C?
- 5. 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
- 6. 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.
- 7. 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?
- 8. 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!
- 9. 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
- 10. 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?
- 11. 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?
- 12. 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 _
- 13. 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.
- 14. 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
- 15. 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
- 16. 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
- 17. 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?
- 18. 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 ______.
- 19. 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
- 20. What is the number of the outermost electrons in manganese? The valence of a chemical change What is the outermost electron number of manganese? The valence of a chemical change