C concentrated solution V concentrated solution C dilute solution V dilute solution .

c represents the concentration of the substance.

v represents the volume of the solution.

The amount concentration of the substance * the volume of the solution = the amount of the substance.

When the solution is diluted, only the solvent is added, and no solute is added, so the amount of solute is the same! That is.

c (concentrated solution).v (concentrated solution) c (dilute solution).v (dilute solution) stands for multiplier sign.

Dilution rule: C concentrated solution v concentrated solution = c dilute solution v dilute solution.

c is the molar concentration and the unit is.

mol/l；

v is the volume, and the unit is.

l；c multiplied by v is the molar amount;

The law of dilution of solutions:

The amount of substances in the solute before and after dilution is unchanged:

C (concentrated solution) V (concentrated solution) = C (dilute solution) V (dilute solution).

The mass of the solute in the solution before and after dilution does not change:

Concentrated solution) v (concentrated solution) w% (concentrated solution) = (dilute solution) v (dilute solution) w% (dilute solution) example.

The concentrated solution is diluted with water to form a dilute solution, and it is ( ) that remains unchanged before and after dilution

a Mass fraction of solute.

b The quality of the solute.

c. The quality of the solution.

d The quality of the solvent.

In the process of diluting the solution with water, the solute remains unchanged, but the quality of the solvent and the quality of the solution change

a. Due to the dilution process, the method of adding water is used, so the solute quality remains unchanged, and the solvent mass increases, so the solute mass fraction becomes smaller, so A is not selected;

B. In the process of adding water to dilute the solution, the solute quality remains unchanged, so B is selected;

c. Due to the use of water in the dilution process, the solute quality remains unchanged, the solvent quality increases, and the solution mass increases, so C is not selected;

d. When diluted into a low-concentration solution, the method of adding water is used, so the quality of the solvent increases, so D is not selected;

Therefore, choose B.

C (concentrated solution) V (concentrated solution) = C (dilute solution) V (dilute solution).

What do you ask? What's the use of having only one title?

Calculations for neutralization titration.

Concentrated solution: The solution containing more solutes per unit mass is called concentrated solution, if the solubility of the substance is very small, then its saturated solution is a concentrated solution relative to its unsaturated solution.

Dilute solution: The solution containing less solute per unit mass is called dilute solution, if the solubility of the substance is very large, then its saturated solution is a dilute solution relative to its unsaturated solution. Less than 100% sulfuric acid is often considered dilute sulfuric acid.

Concentration and dilution relationship: 1. The concentration of the solution is only related to the ratio of solute and the mass of the solution, and has nothing to do with the temperature of the solution, the type of solute and solvent. Alarm wheel.

2. Dilute solution and concentrated solution are relative. Orange bent muffled.

Dilution rule: C concentrated solution v concentrated solution = c dilute solution v dilute solution.

c is the molar concentration and the unit is.

mol/l；

v is the volume, and the unit is.

l；c multiplied by v is the molar amount;

The law of dilution of solutions:

The amount of material in the solute before and after dilution.

No change: C (concentrated solution) V (concentrated solution) = C (dilute solution) V (dilute solution).

The mass of the solute in the solution before and after dilution does not change:

Concentrated solution) v (concentrated solution) w% (concentrated solution) = (dilute solution) v (dilute solution) w% (dilute solution) example.

The concentrated solution is diluted with water to form a dilute solution, and it is ( ) that remains unchanged before and after dilution

a Mass fraction of solute.

b The quality of the solute.

c. The quality of the solution.

d The quality of the solvent.

In the process of diluting the solution with water, the solute remains unchanged, but the quality of the solvent and the quality of the solution change

a. Due to the use of water in the dilution process, the solute quality remains unchanged and the solvent quality increases, so the solute mass fraction becomes auspicious and small, so A is not selected;

B. In the process of adding water to dilute the solution of potato hail, the solute quality remains unchanged, so B is selected;

c. Due to the dilution process, the method of adding water is used, so the solute quality remains unchanged, the solvent quality increases, and the solution quality increases, so C is not selected;

d. When diluted into a low-concentration solution, the method of adding water is used, so the quality of the solvent increases, so D is not selected;

Therefore, choose B.

There is no clear definition of dilute solution, and it is generally conventional.

For example, sulfuric acid below 70% is often considered to be dilute sulfuric acid.

Concentrated and dilute solutions are relative.

For example, if there is a substance that has very little solubility, then its saturated solution is a concentrated solution relative to its unsaturated solution, but compared to the solution of other substances with a high solubility, it is a dilute solution.

Then the calculation formula is: v dilute v concentrated c concentrated c (rare).