1 Do all solutions have saturated solutions?

1.No. Sulfuric acid will never be saturated.

2.When the temperature of ammonium nitrate increases, the solubility also increases. That is, when the temperature is high, the dissolved ammonium nitrate is more than when the temperature is low, and when the temperature is lowered, the solubility also decreases, so some ammonium nitrate crystals are tested.

You Dow put it in cold water to lower the temperature.

As for your second question, it's not necessarily. Because the temperature of some substances decreases, the solubility decreases, and the unsaturated solution will become a saturated solution, such as sodium chloride, which is the case for most substances; As the temperature of some substances decreases, the solubility increases, and the unsaturated solution becomes more unsaturated, as is the case with calcium hydroxide and all gases.

Your third question, don't you just let it "suddenly", the test tube is not as fragile as you think, as long as the temperature is not extremely high to low in an instant, it is not a big deal.

1. No, some substances are miscible and will never reach saturation, such as alcohol and water.

2. It is a method to turn the unsaturated solution into a saturated solution to cool down, but it is also a method to remove part of the solvent by heating. The test tube can tolerate a certain temperature difference and will not break.

Generally speaking, the solubility of solutes increases with the increase of temperature, and it is not excluded that there are special circumstances, such as calcium hydroxide, then the kind of situation you said, ammonium nitrate is solubility increases with the increase of temperature, and it is dissolved more at high temperatures, so in the case of cooling, such as the saturated solution of ammonium nitrate at high temperatures, ammonium nitrate crystals will be precipitated, and there is a certain limit to the bursting of the test tube at a few degrees below zero, such as suddenly roasting on the flame at minus a few degrees, and the temperature difference is relatively large, and the temperature difference in the case you said is not large. Huh

Yes, because everything melts and solidifies.

The concentrated dilute solution is the size of the solute mass fraction contained in the solution, whether the solution is saturated or not is not necessarily related to the concentration of the solution, and the concentrated solution is not necessarily a saturated solution, but may also be a dilute solution; A dilute solution is not necessarily an unsaturated solution, but it may also be a saturated solution, such as a saturated solution of calcium hydroxide is a dilute solution

Therefore, the answer is: a concentrated solution is not necessarily a saturated solution, and a dilute solution is not necessarily an unsaturated solution

The concentration and diluteness of the solution are determined by the amount of a certain solute dissolved in a certain amount of solution, that is, the size of the solute mass fraction.

The saturation or unsaturation of the solution is determined by whether a certain solute can be dissolved in the solution when the conditions remain unchanged, and similarly, regardless of whether the mass fraction of the solute in the solution is large or small at this time, even if the mass fraction of the solute is very small, as long as a certain solute can no longer be dissolved in the solution, the solution is saturated at this time.

In summary, there is no necessary connection between the two.

For example, concentrated sulfuric acid is a solution of about 98% sulfuric acid, but it is not a saturated solution.

The concentration and dilution of the solution are determined by the amount of a certain solute dissolved in a quantitative solution, that is, the size of the solute mass leakage fraction, the mass of the solute is large, and the solution is relatively concentrated, regardless of whether the solution is saturated or unsaturated at this time.

The saturation or unsaturation of the solution is determined by whether a certain solute can be dissolved in the solution when the conditions remain unchanged, and similarly, regardless of whether the mass fraction of the solute in the solution is large or small at this time, even if the mass fraction of the solute is very small, as long as a certain solute can no longer be dissolved in the solution, the solution is saturated at this time.

In summary, there is no necessary connection between the two.

For example, concentrated sulfuric acid is a solution of about 98% sulfuric acid, but it is not a saturated solution.