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Electrolysis is a phenomenon where a reaction is carried out by passing electricity through the molten electrolyte or the electrolytic solution in water. In electrolysis, electrolyte first decomposes into anions and cations and thereafter anions undergo oxidationat anode and cations undergo reduction at cathode. for example. XY (molten ) hArrX^(n+)+Y^(n-) Oxidation at anode : Y^(n-)-"ne"^(-)rarrY Reduction at cathode X^(n+)+ "ne"^(-)rarrX In order to predict the electrolytic products accurately an array of substances is arranged in decreasing order tendency of oxidation of the substances or increasing order of standard reducton potential in electrochemical series. the standard electrode potentials of some species (elements,or ions) is given as under. Cl_(2)(g)+2e^(-)rarr2Cl^(-),E^(@)=1.360V Na^(+)+e^(-)rarrNa,E^(@)=-2.71V 2H_(2)O+e^(-)rarrH_(2)(g)+2OH^(-),E^(@)=-0.83V 2H^(+)+2e^(-) rarrH_(2),E^(@)=OV When aqueous solution of 100mL of 1M NaCl is electrolysed using Pt electrodes then answer the following question. What will b e the pH of the resulting solution upon passage of 0.2F charge |
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Answer» 13 |
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