Hydroxide iron (II), characteristics, properties and production, chemical reactions

Hydroxide iron (II), characteristics, properties and production, and chemical reactions.

 

 

The iron hydroxide (II) is an inorganic substance has the chemical formula Fe(OH)2.

 

Brief description of the hydroxide of iron (II)

Physical properties of iron hydroxide (II)

Obtaining iron hydroxide (II)

Chemical properties of iron hydroxide (II)

Chemical reaction of iron hydroxide (II)

The application and use of iron hydroxide (II)

 


Brief description of the Fe (II):

The iron hydroxide (II) is an inorganic substance of white color. Sometimes has a greenish tint due to impurities salts of iron. Over time, the air darkens due to oxidation, getting dirty-brown color (color of rust).

The chemical formula of Fe (II) Fe(OH)2.

Is one of the intermediate compounds in the rusting of iron.

Does not dissolve in water and other solvents. Solubility in water of 5.2⋅10-5 g/100 ml.

Does not burn. When heated decomposes into iron oxide (II,III) and hydrogen.

The iron hydroxide (II) is found in nature in the form of mineral makinita. This mineral contains traces of magnesium and manganese (empirical formula Fe0 lacinita,7Mg0,2Mn0,1(OH)2). The color of the mineral makinita yellow-green or light green, the Mohs hardness is 3.5 to 4, the density of 2,925—of 2.98 g/cm3.

 

Physical properties of iron hydroxide (II):

Parameter name: Value:
Chemical formula Fe(OH)2
Synonyms and foreign language names iron(II) hydroxide (eng.)
The type of substance. inorganic
Appearance white or light-green trigonal crystals
Color white (sometimes with greenish tint), and the air darkens over time, getting dirty-brown color.
Taste —*
The smell
Aggregate state (at 20 °C and atmospheric pressure of 1 ATM.) solid
Density (state of matter – solid, at 20 °C), kg/m3 3400
Density (state of matter – solid, at 20 °C) g/cm3 3,4
Decomposition temperature, °C 150
Hygroscopicity missing
Molar mass, g/mol 89,86

* Note:

— no data.

 

Obtaining iron hydroxide (II):

In the laboratory iron hydroxide (II) is obtained by the following chemical reactions:

1. the interaction of iron sulfate (II) with potassium hydroxide:

FeSO4 + 2KOH → Fe(OH)2 + K2SO4.

The hydroxide of iron (II) precipitates.

2. as a result of interaction of iron (II) chloride and potassium hydroxide:

FeCl2 + 2KOH → Fe(OH)2 + 2KCl.

The hydroxide of iron (II) precipitates.

The iron hydroxide (II) is prepared by the action of alkalis on iron salts (II) without access of air.

3. the result of the rusting of iron:

2Fe + 2Н2О + O2 → Fe(OH)2.

This reaction is the formation of iron hydroxide (II) is one of the stages of rusting iron. The reaction proceeds slowly.

 

Chemical properties of iron hydroxide (II). Chemical reaction of iron hydroxide (II):

Hydroxide iron (II) – a weak base. Also exerts a weak amphoteric properties, reacts with concentrated alkali.

Chemical properties of iron hydroxide (II) is similar to the properties of the hydroxides of other metals. So it is characterized by the following chemical reactions:

1. the reaction of Fe (II) from phosphoric acid:

Fe(OH)2 + H3PO4 → Fe3(PO4)2 + 6H2O.

The reaction formed a phosphate of iron (II) and water. As a starting material is used a diluted solution of phosphoric acid.

2. the reaction of Fe (II) with nitric acid:

Fe(OH)2 + 2HNO3 → Fe(NO3)2 + 2H2O.

In the reaction, the formed nitrate iron (II) and water. As a starting material is used a diluted solution of nitric acid.

Similar are the reactions of Fe (II) and other acids.

3. the reaction of Fe (II) with hydrogen fluoride:

Fe(OH)2 + 2HF → FeF2 + 2H2O.

In the reaction, the formed fluoride iron (II) and water.

4. the reaction of Fe (II) bromovalerate:

Fe(OH)2 + 2HBr → FeBr2 + 2H2O.

The reaction produces bromide, iron (II) and water.

5. the reaction of Fe (II) yodovidona:

Fe(OH)2 + 2HI → FeI2 + 2H2O.

The reaction produces iodide of iron (II) and water.

6. the reaction of Fe (II) with sodium hydroxide:

Fe(OH)2 + 2NaOH → Na2[Fe(OH)4] (to).

The reaction produced tetrahydrobiopterin (II) of sodium. In the course of the reaction as a starting material is used , the sodium hydroxide in the form of concentrated solution (concentration 50 %). The reaction proceeds at reflux in the atmosphere of nitrogen.

7. the reaction of Fe (II) with ammonium chloride:

Fe(OH)2 + 2NH4Cl → FeCl2 + 2NH3 + 2H2O.

The reaction produces iron (II) chloride, ammonia and water. In the course of the reaction as the initial substance use concentrated hot solution of ammonium chloride.

8. the reaction of hydroxide of iron (II) ammonium bromide:

Fe(OH)2 + 2NH4Br → FeBr2 + 2NH3 + 2H2O.

The reaction produces bromide, iron (II), ammonia and water. In the course of the reaction as the initial substance use concentrated hot solution of ammonium bromide.

9. the reaction of hydroxide of iron (II) ammonium iodide:

Fe(OH)2 + 2NH4I → FeI2 + 2NH3 + 2H2O.

The reaction produces iodide iron (II), ammonia and water. In the course of the reaction as a starting material is used a concentrated hot solution of ammonium iodide.

10. the reaction of Fe (II) with oxygen:

4Fe(OH)2 + O2 → 4FeO(OH) + 2H2O (to).

The reaction formed Metagalaxy iron and water. In the course of the reaction as a starting material is used a hydroxide of iron (II) in suspension. The reaction proceeds while boiling. This reaction also occurs (slowly) in the process of corrosion of iron.

11. the reaction of Fe (II) with oxygen and water:

4Fe(OH)2 + O2 + 2H2O → 4Fe(OH)3.

In the reaction, the formed hydroxide iron (III). This reaction also occurs (slowly) in the process of corrosion of iron.

12. the reaction of Fe (II) metagalaxies iron:

2FeO(OH) + Fe(OH)2 → Fe3O4 + 2H2O (t = 600-1000 oC).

The reaction produced iron oxide (II,III) and water. This reaction also occurs (slowly) in the process of iron corrosion.

13. the reaction of thermal decomposition of iron hydroxide (II):

Fe(OH)2 → FeO + H2O (t = 150-200 oC).

The reaction produced iron oxide (II) and water. Also formed impurities: iron Fe, iron oxide (II,III) Fe3O4.

 

The application and use of iron hydroxide (II):

The iron hydroxide (II) is used:

– in the manufacture of active mass of Nickel-iron batteries.

 

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