Saved Bookmarks
| 1. |
When acidulated water (dil. H_(2)SO_(4) solution) is electrolysed,w ill the pH of the solution be affected ? Justify your answer. |
|
Answer» Solution :* There is no change in PH value. pH value depend on the `H^(+)` ION concentration of any solution. * In acidic water, electrolysis of dilute solution of `H_(2)SO_(4)` gives following reaction. `H_(2)SO_(4) to 2H^(+)+SO_(4)^(2-)` * Reduction of `H^(+)` ions is carried out near cathode. `2H^(+)+2e^(-) to H_(2(g))` * On the surface of anode `H_(2)O` get oxidized not `SO_(4)^(2-)` ion `H_(2)O_((l)) to (1)/(2) O_(2)+2H^(+)+2e^(-)`. . . (ii) OVERALL reaction=(i)+(ii) `H_(2)O_((l)) to H_(2(g)) +(1)/(2)O_(2(g))` * So, in this reaction, concentration of `H^(+)` or `OH^(-)` ions does not change. So, pH remains CONSTANT. |
|