Explain common ion effect. How is it utilized for controlling the concentration of weak electrolyte. (Pharnaceutical Analysis-l)
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ashishbahuguna72
Secondary SchoolChemistry 15+8 pts
Give Reason:-
Any galvanized article is protected against rusting even if the zinc coating is broken.
Why?
Report by ManuBagde 14.05.2014
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ashishbahuguna72
Ashishbahuguna72 · Virtuoso
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Zinc is more reactive than iron and so will always oxidise before iron. Even if the zinc is just in a large block and iron is fully exposed, it will still oxidise first; this is how sacrificial protection of ships works.
To be oxidised, a metal must lose electrons. Zinc, being more reactive can give up electrons easier than iron can. If an iron atom lost an electron, another would be conducted from the block of zinc to replace it. This will continue until all the zinc has oxidised or unless it is no longer in direct contact.
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