01/02/2020
We clean your metalic water tanks professionally and effectively, but first what makes them derty?
The First Step: Oxidation of Solid Iron
It's common knowledge that rust occurs when you leave water on a metal implement or you leave it exposed to moist air. That's because the first step in the rusting process involves the dissolution of solid iron into solution. The formula for this is:
Fe(s) → Fe2+(aq) + 2e-
The electrons produced by this reaction combine with hydrogen ions in the water as well as with dissolved oxygen to produce water:
4e- + 4H+(aq) + O2(aq) → 2H2O(l)
These two reactions produce water and iron(II) ions, but not rust. For that to form, another reaction has to occur.
The Second Step: Formation of Hydrated Iron Oxide (Rust)
The consumption of hydrogen ions that occurs as iron dissolves leaves a preponderance of hydroxide (OH-) ions in the water. The iron(II) ions react with them to form green rust:
Fe2+(aq) + 2OH-(aq) → Fe(OH)2(s)
That isn't the end of the story. The iron(II) ions also combine with hydrogen and oxygen in the water to produce iron(III) ions:
4Fe2+(aq) + 4H+(aq) + O2(aq) → 4Fe3+(aq) + 2H2O(l)
These iron ions are responsible for the formation of the reddish deposit that gradually eats holes in auto bodies and metal roofing worldwide. They combine with the extra hydroxide ions to form iron(III) hydroxide:
Fe3+(aq) + 3OH-(aq) → Fe(OH)3
This compound dehydrates to become Fe2O3.H2O, which is the chemical formula for rust.
Secondly the debris of plan materials and sand that comes along with water and they settle in the water tank .
