Add FeCl3 solution to boiling water

1.It is possible that FeCl3 does not reach the required saturation.

Because the method of preparing Fe(OH)3 colloids is to use saturated FeCl3 after heating to obtain the following equilibrium in the solution: the ionization equilibrium of water and the hydrolytic equilibrium of Fe(Oh)3; Because the hydroxide ions are not added in the preparation, the hydroxide ions in the prepared sol are produced by the hydrolysis after heating, and the amount is very small, so a large number of ferric ions are needed to make the hydrolysis equilibrium of Fe(Oh)3 to the direction of Fe(Oh)3, and ensure that enough Fe(Oh)3 is produced to produce sol].

2.It may have been boiling for too long.

Heating intensifies the movement of molecules, increases the chance of collision between colloidal particles, and multiple colloidal particles collide together to form macromolecular clusters, that is, precipitation

3.It may have been stirred with a glass rod during the preparation process.

The main reason for the stable existence of Fe(OH)3 colloids is that the same kind of colloids have the same kind of charge, and the same kind of charge has a repulsive effect. The stirring of the glass rod will weaken the ability of the colloids to adsorb the charge, and destroy the metastability of Fe(OH)3 colloids

4.It is possible that the boiling water is tap water and has more impurities.

In the case of tap water, it is inevitable that there will be impurities, and the ions contained in it may cause precipitation with FeCl3

Boiling water is added to FeCl3 to form Fe(OH)3 (colloid) [Chapter 1 of the Senior 3 Textbook] Seeing the bright pathway is the nature of colloids.

Summary. Hello, drop the saturated FeCl3 solution into boiling water to turn reddish-brown and continue to heat the FeCl3 solution into boiling water, continue to heat until it generates a reddish-brown liquid, you can prepare Fe(OH)3 colloid, and complete the chemical equation of the reaction.

Hello, the saturated FeCl3 solution is dropped into the boiling water and boiled water to turn into a reddish-brown color, and the FeCl3 solution will be dropped into the boiling water, and the heating will continue to be heated to the formation of a reddish-brown liquid cavity, and the Fe(OH)3 colloid can be prepared to complete the chemical equation of the reaction.

reddish-brown; Fe(OH)3 colloid; (1) Vertical irradiation of the colloid with light will produce the Tyndall effect, that is, a bright "pathway" appears in the colloid, which is because of the scattering effect of colloidal particles on light, so the answer is: a bright "pathway" appears in the colloid; scattering of light by colloidal particles; (2) The addition of colloids to the electrolyte solution will damage the charge stability of colloidal particles due to the broken draft, causing them to coalesce and settle into Fe(OH)3 precipitation, so the answer is: the charge of the ionized ion (Cl-) of HCL and the charge of colloidal particles are electrically neutralized, which destroys the metastability of the colloid, so that the colloidal particles aggregate into larger particles and settle down; Fe(OH)3 precipitate reacts with hydrochloric acid to form brownish-yellow Fe3+, Fe(OH)3+3HC1 Feci3+3H2O, so the answer is:

Fe(OH)3+3HCl FeCl3+3H2O Comments This question examines the properties of the glue parabody, which is not very difficult, and the properties of the colloid are: Tyndall effect, electrophoresis, and polyprecipitation; The use of the Tyndall effect is a common physical method to distinguish colloids from solutions

Preparation method of ferric hydroxide colloid: add a few drops of ferric chloride saturated solution to boiling water, hydrolyze ferric chloride to form ferric hydroxide colloid, increase the temperature to promote the hydrolysis of ferric chloride, and heat until the liquid is reddish-brown to obtain ferric hydroxide colloid, so the question is wrong, so the answer is:

Colloids generated: FeCl3 + 3H2O = Heat = Fe(OH)3 (colloid) + 3HCl

Fe(OH)3 colloids are generated.

Equation: FeCl3 + 3H2O = (heating) Fe(OH)3 (colloid) + 3HCl

The solution contains FeCl2 and is removed by introducing excess Cl2Traces and programs.

is 2FeCl2 + Cl2 ==2FeCl3

The solution contains FeCl3, and the method of removing it is to add excess iron powder and stare at the filter pants to know it.

The equation is: 2FeCl3 + Fe ==3FeCl2

Phenomenon: Turns brownish-yellow Fe2(SO4)3 again

Reason: Fe(OH)3+3H+==Fe3+ +3H2O

Clo- is very oxidizing and Fe3+ will be degraded by Clo- oxidation and referred to as FeO4 2-, where Fe is +6 valence.

The ionic equation is 2Fe3+ +3Cl- +10OH- =2FeO4 2- +3Cl- +5H2O

The reactions are simultaneous.

fe2hcl

fecl2h2

fe2o36hcl

2fecl3

3H2O generates Fe( ) in the process of reaction, and it can react with Fe.

fe2fecl3

3fecl2

In fact, only fe( ) is generated for a period of time.

There is no order of these two reactions, only the order of the historical state speed and slowness, the electrode potential of Fe3+ Fe2+ is +, the electrode potential of Fe2+ Fe is, and the hydrogen electrode is 0, so the reaction speed of Fe2O3 is faster. Li Qing.