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Potassium nitrate solution with mass fraction of 20%, in which solute: solvent: solvent = at 10 ℃, the solubility of a substance is At 10 ℃, the solubility of a substance is 5g. At this temperature, in the substance saturated solution, solute mass: solvent mass: solution mass= Mass fraction of solution=
Potassium nitrate solution with mass fraction of 20%, in which solute: solvent: solution = 1:4:5
At 10 ℃, the solubility of a substance is 5g. In the saturated solution of the substance at this temperature, solute mass: solvent mass: solution mass = 1:20:21
Mass fraction of solution = 1 / 21 * 100% = 4.76%
When the solubility of a substance is 50g at 50 °, the mass fraction ratio of solute, solvent and solution in saturated solution at this temperature
Solubility refers to the mass of solute dissolved in 100g saturated solvent at a certain temperature
So the solute mass in this problem is 100g,
The mass fraction of solute is: 50 / (100 + 50) = 33.33%
The mass fraction of solvent is: 100 / (100 + 50) = 66.67%
The mass fraction of the solution is (it seems that I haven't seen how to find the mass fraction of the solution. Is it wrong, but if it's hard to ask): (100 + 50) / (100 + 50) = 100%
Is solubility related to solute quality and solvent quality
Solubility has nothing to do with solute quality and solvent quality, but only with temperature
Because, at a certain temperature, the amount of solvent must be 100 grams, and the added solute must be the number of grams dissolved in the saturated state,
Relationship between solubility and mass fraction of saturated solution
At a certain temperature, the mass of a solid substance dissolved when it reaches saturation in 100g solvent is called the solubility of this substance in this solvent. The mass fraction of solute in solution is the ratio of solute mass to solution mass. Solute mass fraction = solute mass / solution mass * 100% solubility = solute mass / solvent
What is the difference between solubility and mass fraction? How to calculate the solubility?
Solubility refers to the mass of the most soluble substance in 100g water at a certain temperature
Mass fraction refers to the percentage of solute mass in solution mass
Calculation of solubility
In saturated solution, solute / solvent = s / 100
What is the relationship between the solubility and mass fraction of substances? Let the solubility be s and the mass fraction be x%. Is x related to s?
For a saturated solution of the same solute at the same temperature:
S>C
C%＝S/(100+S)
RELATED INFORMATIONS
- 1. Relationship between mass fraction For example, the solubility of a solution increases with the increase of temperature, and its mass fraction is p, so its mass fraction decreases after the increase of temperature. I know this. Isn't the mass fraction of solute divided by the mass of solution? Then, when the temperature rises, only the solubility, solute mass and solution mass have not changed (assuming that water does not evaporate), isn't its mass fraction unchanged? How did it get smaller? This friend on the second floor doesn't understand what I mean. Let's mention the specific topic. If you want to change the mass fraction of potassium nitrate saturated solution at a certain temperature, reducing the temperature is also a way. Once the temperature is reduced, the solubility of potassium nitrate solution increases, but no new solute is added, but the maximum solubility of the solution changes. Isn't this process that the solute quality and solution quality haven't changed? How did the mass fraction change? It's not what the friend on the second floor said
- 2. When the solubility of a solute is s g at a certain temperature, the mass fraction of solute in saturated solution at that temperature () A. Greater than S% B. Equal to S% C. Less than S% D. Unable to judge
- 3. A factory needs to use dilute sulfuric acid with solute mass fraction of 28% to remove rust for metal. The purchaser bought 2000ml98% concentrated sulfuric acid (density: 1.84g/cm3) from the chemical plant. How many kilograms of 28% dilute sulfuric acid can the worker master dilute it? How many liters of water do you need? My answer is: 2000mL × 1.84g/cm3 × 98％=3.6064kg 3606.4g÷（28％ × 1g/cm3）=12.88L But the correct answer is: 12.88kg 9.2L
- 4. （7） 42-5 junior high school chemistry, what is the wrong description of these two particles? Give reasons There are two kinds of particles, the total number of protons in their nucleus is different, but the total number of electrons outside the nucleus is equal. The description of these two kinds of particles is wrong () A. It may be atoms and ions of the same element. B. it may be atoms and ions of different elements C. It cannot be atoms and ions of the same element D. it may be molecules and ions composed of the same element
- 5. The following experimental phenomena are described incorrectly () A. Red phosphorus burns in the air and white smoke is produced B. Sulfur burns in oxygen and emits a light blue flame C. Bubbles are generated when the iron wire is inserted into dilute hydrochloric acid D. Purple litmus solution turns red after being filled with carbon dioxide
- 6. It is known that the mass fraction of nitrogen in the solid mixture of NH4NO3 and KH2PO4 is 28%, so the mass fraction of KH2PO4 in the mixture is () A. 20% B. 25% C. 85% D. 80%
- 7. What is meant by a sucrose solution with a mass fraction of 80g solute of 5%
- 8. How many grams of water need to be evaporated to concentrate 100g of sucrose solution with 10% mass fraction into 20% sucrose solution
- 9. 13 g of zinc reacts with 100 g of dilute sulfuric acid to find: (1) the mass of oxygen produced (2) the mass fraction of dilute sulfuric acid
- 10. In 196 g sulfuric acid solution, 32.5 g zinc is added to just complete the reaction. Find the mass of hydrogen produced after the reaction?
- 11. A group measured the mass fraction of calcium carbonate in a limestone. 20g was taken as a nurse sample. 100g of dilute hydrochloric acid with a certain solute mass fraction was added to it
- 12. 25g limestone containing 20% impurities fully reacts with 100g sufficient dilute hydrochloric acid (impurities do not participate in the reaction) Requirements: 1. What is the mass of carbon dioxide generated? 2. How many kilograms of calcium chloride are generated?
- 13. How many grams of carbon dioxide are prepared by fully reacting 100g limestone containing 80% calcium carbonate with 100g dilute hydrochloric acid (assuming that all calcium carbonate react) 1? What is the mass fraction of the solute of the dilute hydrochloric acid
- 14. What is the chemical equation between carbon dioxide and limestone
- 15. The experiment requires 13.2 grams of carbon dioxide, which is prepared by the reaction of calcium carbonate and sufficient dilute hydrochloric acid. How much calcium carbonate is needed