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Metallic sodium is extracted by the electrolysis of brine (eq. NaCl) .After electrolysis the electrolytic solution becomes basic in nature.Write the possible electrode reactions. |
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Answer» SOLUTION :Brine is a solution chloride (molten state). The process of electrolysis involves using an electric current to bring about a chemical change and MAKE new chemicals.In the electrolysis of brine ,sodium ions migrate to the cathode ,where ELECTRONS ENTERS the melt and are reduced to sodium metal . `Na^(+)e^(-)toNa(at cathode)` Chloride ions migrate the other way toward the anode.They give up thier electrons to the anode and are oxidised to chlorine gas. `Cl^(-)to(1)/(2)Cl_(2)+e^(-)`(at anode) Overall reaction:` 2NaCl to 2Na(s)+Cl_(2)(g)` For aqueous solution of NaCl:`H_(2)O+2e^(-) to H_(2)uarr+2OH^(-)` (at cathode) `Cl^(-) to (1)/(2)Cl_(2)+e^(-)`(at anode) Overall reaction: `NaCl(aq)+H_(2)O to Na^(+)(aq)+OH^(-)(aq)+H_(2)(g)+(1)/(2)Cl_(2)(g)` After electrolysis the electrolytic becomes basic in nature.[Due to FORMATION of hydroxide `(OH^(-))` ion]. |
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