Account for the following: "Alkaline medium inhibits the rusting of iron".
Asked by Topperlearning User | 22nd Jun, 2016, 03:00: PM
In the process of rusting of Iron the hydroxide ions react with ferrous ions from the solution to give reddish brown substance ferrous hydroxide at the cathode. Hydroxide ions are formed by the reduction of Hydrogen ions, in alkaline medium the number of hydrogen ions decreases thereby decreasing the number of hydroxide ions in the solution , slowing the process of rusting of iron.
Answered by | 22nd Jun, 2016, 05:00: PM
- What is Corrosion? Do we observe corrosion only in Iron?
- What are the essential requirements for corrosion to take place?
- Give three easier ways of preventing rusting of Iron.
- Why carbon dioxide dissolved in water increases the rate of rusting?
- Oxygen is essential for rusting. But a portion of iron rod in contact with oxygen is not damaged rather the other end is damaged. Explain why?
- Rusting of iron becomes quicker in saline medium. Explain.
- Iron does not rust even if the zinc metal coating on its surface is broken but the same is not true when coating is of Tin.
- What is meant by Cathodic protection of the Iron? Explain it taking the example of Magnesium attached to an Iron tank or pipe.
- How des galvanization of Iron Prevents its rusting?
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