Suggest a series of reactions involving common atmospheric ages which could be c

Question

Suggest a series of reactions involving common atmospheric ages which could be converted Zn into ZnCO3.

If the ZnCO3/Zn coating of galvanized Iron is broken and the underlying iron begins to corrode, a chemical reaction intervenes and converts the corrosion products back to iron. Suggest a reaction which could account for this chemical protection of the iron.

2. Galvanization is a process of protecting iron from corrosion by coating the metal with a layer of zinc. Although Zn is more active than Fe, Zn reacts with atmospheric gases to form zinc carbonate (ZnCOs), a hard, durable substance which shields the remaining Zn and the underlying Fe. Suggest a series of reactions involving common atmospheric gases which could converted Zn into ZnCO . If the ZnCOy/Zn coating of galvanized iron is broken and the underlying iron begins to corrode (i.e., oxidize), a chemical reaction intervenes and converts the corrosion products back to iron. Suggest a reaction which could account for this chemical protection of the iron. 229

Explanation / Answer

Q2

In the air:

N2, O2, CO2, H2O gases are present

so..

for ZnCO3 formation, there is deffinetively:

there is clearly CO3-2 presence

typical from acid rain

H2O + CO2 = H2CO3

so..

H2CO3(g) = H2CO3(aq)

so

H2CO3 <--> 2H+ + CO3-2

which reacts with

Zn(s) + CO3-2(aq) = ZnCO3(s)

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