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