Give examples why some nail showed corrosion at the air/water interface. An in g

Question

Give examples why some nail showed corrosion at the air/water interface. An in ground petrol storage tank at an ADNOC station is buried at depth so that sites partially below the water table. Over a period of time where would you expect most external corrosion of the tank? Give reason for your answer Explain the reason for the different amounts of corrosion in the nails in tap water, distilled water and boiled distilled water · » If corrosion of the nail in sodium chloride solution is an electrochemical (oxidation/reduction) process involving oxygen write half equations to show how iron corrodes. There is no corrosion of the nail in sodium hydroxide solution. Why? Corrosion of the nail in hydrochloric acid solution does not involve oxygen in the corrosion mechanism. USE half equation to explain why

Explanation / Answer

Fe(s) Fe2+(aq) + 2 e–

O2 + 2 H2O + 4e– 4 OH–

H+ + e– ½ H2(g)

M2+ + 2 e– M(s)   where M is a metal.

2H+Cl- + Fe0 => H2 + Fe++Cl-2

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