How to distinguish colloids from solutions? How to chemically distinguish colloids from solutions?

To talk about the concept of gelatin, let's first look at the concept of dispersion system: chemically the mixture formed by the dispersion of one substance (or several substances) into another substance in the form of particles is collectively called the dispersion system. The substance dispersed into particles in the dispersion system is called a dispersion, and another substance is called a dispersant.

Solutions, colloids, suspensions or emulsions are all divided according to the size of the dispersed particles: the dispersion particles are less than 1 nm is the solution; greater than 100nm is a suspension or emulsion; The dispersion system of dispersed particles between 1 nm and 100 nm is colloidal.

As long as the dispersion meets the above requirements, a colloid is formed.

Milk is a cloudy liquid, not a colloid (absolutely not wrong!). ）。

Colloids have many properties that are not found in ordinary solutions, for example, colloids have Tyndall phenomenon.

Electrophoresis phenomenon, poly-sinking phenomenon (alum.

principle of water purification) and dialysis (hemodialysis.

principle).

The Tyndall effect can be used to distinguish between them. That is, a beam of light is used to irradiate the solution and the colloid separately, and the position perpendicular to the beam is observed.

Apply the Tyndall effect.

If a laser is used to irradiate the liquid in the glass, if it can form a light path, it is a colloid, otherwise it is a solution.

1.To understand the concept of colloids accurately: the essential difference between colloids, solutions, and turbidity liquids is the size of the diameter of dispersed particles (colloidal dispersed particles with a diameter between 1 100 nm).

2.Understanding the properties of colloids: Tyndall's phenomenon is caused by the scattering of visible light by colloidal dispersed particles, which can distinguish solutions from colloids; Colloids cannot penetrate semi-permeable membranes.

3.How to distinguish between solution colloids and turbidity: pay attention to the combination of colloidal knowledge and modern scientific and technological achievements, and examine the application of colloidal knowledge.

Hello! The above two are both physical methods.

As for the chemical method you mentioned, it is as follows:

Add electrolyte and dismantle, if there is large particulate matter agglomeration, it means colloid.

No. No.

I hope to help you with skillful sheds, and hope to be filial piety.

A solution and colloids can be distinguished by the Tyndall effect.

The difference between colloids and solutions is that colloids have a Tyndall effect, while a number of solutions do not, and they can be distinguished from each other.

Tyndall effect: When a beam of light passes through the colloid, a bright pathway will appear in the colloid, which is formed by the scattering of light by colloidal particles.

Take these two solutions in a test tube, heat the colloid, and the particles are concentrated and settled, and vice versa.

The difference between colloidal and solution is:

Colloids have a Tyndall effect, while solutions do not, and the two can be distinguished according to this specific operation:

A laser beam (a commercially available small laser) is used to irradiate the two systems, the one with the bright path is the colloid, and the other is the solution.

Both of the above are physical methods.

As for the method you said, it is as follows:

Add electrolytes, if there are large particles of matter in this sock, it means that it is colloidal.

No. No.

Solution and colloidal are two different dispersion systems, the appearance of the two is difficult to distinguish, the essential difference between the two is that the particle size of the dispersed substance is different, the bridge height of the dispersed plasmid in the solution is less than nanometer, and the particle size of the dispersed plasmid in the colloid is between 1-100 nanometers, both of which can penetrate the filter paper, Tyndall effect.

Refers to when the sensitive potato is visible.

When irradiating colloids, there will be bright pathways, which are unique properties of colloids, which can be used to distinguish solutions from colloids, Brownian motion.

It refers to the phenomenon of suspended particles constantly moving irregularly, which is not specific to colloids

Answer] D Answer Analysis] Test Question Analysis: The easiest way to identify colloids and solutions is the Dahl effect of the Ding coder, and the answer is D.

Test Center: Examine the judgment of solutions and colloids.

Comments: Both solution and colloid belong to the dispersed pure trillion system, and the substantive difference between the two is that the diameter of the dispersed ions is different. The Tyndall effect is commonly used to distinguish between the two.

The Tyndall effect is the simplest, it can be irradiated with a flashlight, and the light path is the colloid, and the solution is not.

Colloidal solutions are not solutions, they are just used to being called so. The essential difference is, of course, the diameter of the particles in the dispersion system: the diameter of the solution particles is 1 nm (10-9 m), and the diameter of the colloidal particles is between 1 nm and 100 nm.

The solution is more stable than the colloid. Colloids have properties that solutions do not have: 1:

Tyndall effect (when a laser pointer is irradiated vertically to the colloid and the solution, a bright path of light appears inside the colloid, while the solution does not.) 2: Brownian motion (irregular motion of colloidal particles) 3:

Electrophoresis 4: Poly-sinking.

The Tyndall effect.

The British physicist John Tyndall was the first to discover and study the above phenomena in colloids. This bright pathway is formed by the scattering of light by colloidal particles.

When a beam of light passes through the colloid, a bright path in the colloid can be observed from the vertical direction of the incident light, which is called the Tyndall phenomenon, also known as the Tyndall effect, the Tynzel phenomenon, the Tinzel effect, and the Tyndear effect. Practical application: for the identification of colloids and solutions.