It is a substance composed of ferrous ions and sulfur ions

It is ferrous sulfide (Fes).

The laboratory also uses it to react with dilute sulfuric acid to produce hydrogen sulfide.

fes+h2so4==feso4+h2s↑

1. The iron ion is Fe3+, and the ferrous ion is Fe2+.

2. Ferrous ion [Fe2+], metal cation, ion symbol Fe2+. It is generally light green, has strong reducibility, and can react with many oxidants, such as chlorine, oxygen, etc. Therefore, it is best to prepare the ferrous ion solution and add some iron powder to it during storage (iron ions have strong oxidation and can react with iron elements to form ferrous ions) Ferrous ions also have oxidation, but the oxidation is relatively weak, and can be replaced with magnesium, aluminum, zinc and other metals.

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.

1.Iron ions can react with metals (such as Cu and Ag) that are weaker than iron to form ferrous ions. 2fe3+

cu2fe2+

Cu2+ (iron ions are more oxidizing than copper ions).

2. Iron ions can also be associated with a small amount of metals that are more reducible than iron but do not react with water (such as. mgalzn) reaction to form ferrous ions. 2fe3+

zn2fe2+

Zn2+ (Zn as a reducing agent, which can reduce iron ions to ferrous ions) If there is an excess of these metals, it will further reduce ferrous ions to single finger iron.

3. Iron ions can also react with iron to form ferrous ions (centering reaction) 2Fe3+Fe

3fe2+

Iron dust digging ion has (oxidizing) properties. Ferrous ions have (oxidizing.

and reductive) but mainly reductive.

Analysis: Hail valency of iron in iron ions.

It's +3 price, it's at the most, and it's only reductive. The iron in the ferrous ions is +2 valence, which is between 0 and +3 valence, so it is oxidizing and reducing.

Fe3+ (iron ions with three units of positive charge).

Fe2+ (ferrous ions with two units of positive charge).

Fe2+ +S2-==Fes (precipitation).

Ferrous sulfide precipitates are soluble in strong acids.

Ferrous ions (Fe2+) are generally light green in color, and iron ions are yellow.