Question

==>>100 pts <<==

Write equation of preparation for Peroxodisulphuric acid ?​

Answer 1

H2SO4 + H2O → H3O+ + HSO4- (dissociation of sulfuric acid)

2HSO4- → H2S2O8 + 2e- (E0 = +2.4V) (bisulfate oxidation)

2H2SO4 → H2S2O8 + H2 (overall reaction)

3H2O → O3 + 6H+ (ozone produced as a side product)

Answer 2

✔✔✔The acid is prepared by the reaction of chlorosulfuric acid with hydrogen peroxide

2ClSO3H + H2O2 → H2S2O8 + 2 HCl

Another method is the electrolysis of moderately concentrated sulfuric acid (60-70%) with platinum electrodes at high current density and voltage:

✔✔H2SO4 + H2O → H3O+ + HSO4- (dissociation of sulfuric acid)

✔✔2HSO4- → H2S2O8 + 2e- (E0 = +2.4V) (bisulfate oxidation)

✔✔2H2SO4 → H2S2O8 + H2 (overall reaction)

✔✔3H2O → O3 + 6H+ (ozone produced as a side product)