Why ethyl alcohol is used to wash nickel precipitate?
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Very simple as DNA is insoluble in alcohols (Ethanol & Isopropanol) we use 100% alcohols for precipitation so we get good amount of DNA. Washing with 70% alcohol is to remove the excess of salts (that might have come along with the extraction buffers) i.e. the excess of salts dissolve in the 30% of water.
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