![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
After a certain amount of M substance solution is evaporated at a certain temperature by 15 g of water,2 g of crystal is precipitated, another 15 g of water is evaporated, and another 5 g of crystal is precipitated. If another 15 g of water is evaporated, the mass of precipitated crystal is () A.2 g B.5 g C.8 g D. Inability to judge
After evaporation of 15 g of water,2 g of crystal is precipitated, then 15 g of water is evaporated, and then 5 g of crystal is precipitated. It can be known that the solution is an unsaturated solution at the beginning, and the solution after precipitation of 2 g of crystal is a saturated solution. After evaporation of 15 g of water,5 g of crystal is precipitated, which is the evaporation of saturated solution. Therefore, if another 15 g of water is evaporated, the mass of precipitated crystal is still 5 g.
Therefore, B.
At a certain temperature, after the unsaturated solution evaporates 15g of water (part),2g of crystal (excluding crystal water) is precipitated; after 5g of solute crystal is put into the original solution,1g of solid solute remains in the solution, the solubility of the solute at this temperature is () A.13.3 g B.26.7 g C.33.3 g D.40 g
According to the meaning, the unsaturated solution evaporates the solvent
The saturated solution continues to evaporate to 15 g
2G of crystal is precipitated, and 1g of solid solute remains in the solution after 5g of solute crystal is added to the original solution, indicating that the original solution reaches saturation state when 4g of solute is dissolved, indicating that if 6g of solute is dissolved in the evaporated 15g of water, i.e.0.4g of solute is dissolved in each gram of water at most,40g of solute is dissolved in 100g of water at most, so D.
RELATED INFORMATIONS
- 1. How to precipitate potassium nitrate crystals from a mixed solution of potassium nitrate and sodium chloride in a mass ratio of 1:1?
- 2. What method is used to separate and purify sodium chloride crystals from a mixture of sodium chloride and potassium nitrate (small amount)? If there are 10g sodium chloride crystals in the original mixture, will the mass of these crystals be less than 10g after purification?
- 3. Operation of extracting sodium chloride crystals from a sodium chloride solution containing a small amount of potassium nitrate Extraction of Sodium Chloride Crystals from a Sodium Chloride Solution Containing amount of potassium nitrate
- 4. In industry, how to precipitate copper sulfate crystal in low concentration copper sulfate solution (except evaporation method)? Evaporation must be too expensive, is there any most economical way? Does anyone know what methods are used in industry? How much electricity is required for evaporation of 1 kg of water?
- 5. Why does the phenomenon of calcium hydroxide saturated solution become turbid rather than crystallized when the temperature is raised
- 6. At 20°C,5 g of water is evaporated from 200 g of saturated sodium chloride solution, and how many g of sodium chloride crystals are precipitated?
- 7. How does the grain size affect the mechanical properties of the material?
- 8. About Crystals and Crystals What is the point in the chemical formula? I haven't learned anything about crystals. Can you tell me more about them? Such as basic cop carbonate and copper carbonate, copper hydroxide,
- 9. Saturated solution. Crystallization occurs when the solution is heated or cooled.
- 10. Is it certain that crystals will precipitate when the saturated solution cools down? Must the solution of the precipitated crystals be a saturated solution of the solute at this temperature? Tell me the reason. Is it certain that crystals will precipitate when the saturated solution cools down? Must crystals precipitate when saturated solution cools down? Must the solution of the precipitated crystals be a saturated solution of the solute at this temperature? Tell me the reason. Must crystals precipitate when saturated solution cools down?
- 11. If the temperature is not changed, when 10g of water is evaporated,4g of A crystal (excluding crystal water) will be precipitated. When 10g of water is evaporated again,6g of A crystal will be precipitated.
- 12. Does evaporative crystallization mean increasing the temperature or evaporating the solvent? NaCL is crystallized by evaporation and KNO3 is crystallized by cooling. What about Ca [OH ]2?
- 13. At t°C, the NaOH solution with a% mass fraction of solute was evaporated off mg of water and then recovered to the original temperature. At t.degree. C., the solution of NaOH with a mass fraction of solute was evaporated off mg of water and recovered to the original temperature, and the saturated solution of NaOH with a mass fraction of 2a, and the mass of the original solution was obtained At t°C, the NaOH solution with a% mass fraction of solute is evaporated off mg of water and then recovered to the original temperature. At t.degree. C., the solution of NaOH with a mass fraction of solute was evaporated off mg of water and recovered to the original temperature, and the saturated solution of NaOH with a mass fraction of 2a, and the mass of the original solution was obtained
- 14. A solution of sodium chloride at 80°C,20 g of water evaporated at constant temperature,2 g of crystals precipitated,20 g of water evaporated at constant temperature,4 g of crystals precipitated, and how many g of crystals precipitated if 35 g of water evaporated at constant temperature? At 20°C, the solubility of sodium chloride is 31 g. At present,500 g of 20% sodium chloride solution is available. If 5 g of sodium chloride crystal will be precipitated at this temperature, what is the mass of water to be evaporated?
- 15. 100 G of the solution of the substance A at 50 degrees centigrade was divided into two parts, one part evaporated at constant temperature 10 g of water with 4 g of crystals precipitated, the other part evaporated 20 g of crystals precipitated 20 g, Solubility in 50 degrees Celsius. Must have a process, thank you very much!
- 16. At 50.degree. C., the solution of substance A was divided into two equal parts by mass, one part evaporated off 10 g of water to precipitate 4 g of crystal, and the other part evaporated off 20 g of water to precipitate 10 g of crystal Solubility of substance A at 50°C
- 17. 200 G of silver nitrate solution at T degree,10 g of precipitated crystal 4 g evaporated,10 g of water evaporated and 6 g washed out,20 g of water evaporated to precipitate crystal mass 200 G of silver nitrate solution at T degree,4 g of precipitated crystals evaporated off 10 g,6 g of precipitated crystals after 10 g of water evaporated, and what is the mass of precipitated crystals after 20 g of water evaporated? 200 G of silver nitrate solution at T degree,10 g of precipitated crystals 4 g evaporated,10 g of water evaporated and 6 g washed out,20 g of water evaporated to precipitate crystal mass 200 G of silver nitrate solution at T degree,4 g of precipitated crystals evaporated off 10 g,6 g of precipitated crystals after 10 g of water evaporated, and what is the mass of precipitated crystals after 20 g of water evaporated? 200 G of silver nitrate solution at T degree,10 g of precipitated crystals 4 g evaporated,10 g of water evaporated and 6 g washed out,20 g of water evaporated to precipitate crystal mass 200 G of silver nitrate solution at T-degree,4 g of precipitated crystals evaporated out of 10 g,6 g of precipitated crystals after 10 g of water evaporated, and what is the mass of precipitated crystals after 20 g of water evaporated?
- 18. At 10 degrees,131 grams of saturated KCl solution, after evaporation of 10 grams of water, at 10 degrees, the mass of KCl crystals can be precipitated At 10°C,131 g of saturated KCl solution, after evaporation of 10 g of water, the mass of KCl crystals can be precipitated at 10°C
- 19. When the solvent degree of sodium chloride is 36g at 20°C, the mass fraction of solute of saturated sodium chloride solution at this temperature is _______; when 10g water is evaporated from the modified solution and then cooled to 20°C, the mass fraction of solute of the remaining solution _________
- 20. Judgement: If the laboratory evaporates a sodium chloride solution to precipitate crystals, the mass fraction of the solute must be reduced. Judgement: The laboratory evaporates a sodium chloride solution to precipitate crystals, and the mass fraction of the solute must be reduced.