What ionic compound of iron is a blue precipitate

All valence states of iron are not blue in ionic compounds. Only copper, for example, copper hydroxide.

Iron does not have blue precipitation, and copper precipitation is blue.

Ferrous ions. and iron ions in the presence of water and anhydrous, showing different colors.

Ferrous ions, in the absence of anhydrous, are colorless and complex 4 water molecules.

Later, the noise was blue-green. Anhydrous ferric ions are dark red, and when complexed with water, they form a vertical brownish-red color.

Summary. Hello dear, iron ion color: The color of iron ions varies due to their different oxidation states.

Monovalent iron ions (Fe) are usually green or lavender in color; Divalent iron ions (Fe) are usually yellow, orange, or brownish-red. Different complexes also have an effect on the color of the iron ions, for example, the iron ion hexahydrate ([Fe(HO)] is purple, while the ferric(III)(Fe(No)) solution is brownish-red.

Hello dear, iron ion color: The color of iron ions varies due to their different oxidation states. Monovalent iron ions (Fe) are usually green or lavender in color; Divalent iron ions (Fe Nashishan) are usually yellow, orange, or brownish-red.

Different complexes also have an effect on the color of iron ions, e.g., iron ions hexahydrate ([Fe(HO)] are violet-neutral, while ferric(III) nitrate (Fe(NO) dissolved celery is brownish-red.

Extension: The following is more information about the color of iron ions: The color of iron ions in different oxidation states is not absolute, and will also be affected by the acidity and alkalinity of the solution, temperature, light and other factors.

In general, the higher the concentration of iron ions, the darker their color, but when the concentration exceeds a certain range, the color may be reversed.

Iron ions are commonly used in dyeing, catalysts, and other industrial fields, among which, Feso4 (ferrous sulfate) and Fe2O3 (ferrous oxide) are among the most commonly used iron ion compounds. For example, iron ions are one of the important components of human hemoglobin, and can also play a role in eutrophication prevention and water pollution wheel dyeing in nature.

1: [Iron from the beard] trivalent iron begins to precipitate around the left, and the precipitation is complete around 5, and the divalent iron can be oxidized to trivalent iron and precipitate when it is blown into the air, and the air is very easy to oxidize the bivalent iron, and it can be basically precipitated.

2: [Magnesium ions] Whether the ions precipitate or not is related to the solubility of the substance. In high school chemistry, the solubility product is used to solve the problem.

When the concentration of ions in the solution is less than the minus fifth power of ten), the ions are considered to have precipitated completely. However, it is actually a matter of dynamic equilibrium. Whether the completely precipitated ions can react with the solution depends on the composition of the solution.

For example, after iron ions are converted into iron hydroxide precipitation, they can still react with hydrochloric acid and re-enter the solution.

3: [Ferrous ions] Ferrous sulfate has strong redox properties, but it needs to be in an alkaline environment to give full play to its oxidation and coagulation effects. The Fe2+ decomposed from ferrous sulfate in wastewater is a single-nucleus complex, and its coagulation effect needs to be at pH value >> 7, the Fe2+ of ferrous salt is easily oxidized into ferric iron by dissolved oxygen in water, and then its coagulation reaction occurs.

fe3+ 4fe(oh)2+2h2o+o2——4fe(oh)3。If ferrous sulfate is used for decolorization, its optimal pH value is more than 9, when the pH value reaches more than 8, the multinuclear complex formed after the hydrolysis and oxidation of ferrous sulfate makes the colored suspended dye substances in the wastewater bond into floc precipitation through net capture coagulation, and its decolorization rate can reach 92%. Of course, some pH values need to be adjusted with the help of alkali agents (such as lime), which can not only adjust the pH value, but also play a role in coagulation and phosphorus removal.

When the ferrous sulfate is used to remove COD, the best pH value of ferrous sulfate is within the range of 7 8, ferrous sulfate has a neutralizing and destabilizing effect on the suspended colloidal particles in the water, and the iron hydroxide colloid generated by the water is a strong adsorption of the adhesive, when the COD in the water is insoluble COD, it will be electroneutralized and then condensed, and it will be captured and adsorbed into a clump by the iron hydroxide mesh together, and the sludge will be precipitated, and the removal rate can reach 88%. Divalent iron ions begin to precipitate ph = complete precipitate ph = .

4: [Aluminum ions] begin to precipitate pH = complete precipitation pH = .

Yellow.

According to the information of the ninth-grade chemistry textbook of the People's Education Edition, the iron ions are yellow in the solution, and the ferrous ions are light green in the solution, so the solution color of the iron ions is yellow.

The oxide color of iron is ferrous iron black in oxy-permeable mountain, red iron oxide, iron black in the trioxide bush, ferrous hydroxide precipitate gray-green, iron hydroxide precipitated reddish-brown, iron chloride brown-black, blood red in ferric thiocyanide ion solution, and iron sulfide yellow.

1. Copper ions --- blue.

2. Ferrous ions --- light green.

3. Iron ion -- light purple (generally brownish-yellow in solution).

4. Manganese ions--- light pink.

5. Cobalt ions --- pink.

6. Nickel ions --- green.

7. Chromium ion - blue-green.

8. Chromium ion -- green.

9. Cadmium ion - blue-green.

10. Gold ions--- golden yellow.

Color is determined by the electromagnetic waves emitted or reflected by objects of different wavelengths, which is the perception of human vision, and some ions show different colors, which are determined by their intrinsic chemical properties.