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acx01b
(Newbee)
10-21-04 19:17
No 537063
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electrolysis of 30% H2SO4
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Hi,
electrolysis with platine of H2SO4(30%) 12V 0.7A let's do this for 48hours with 50mL of 30% H2SO4 (d=1.26, 18,9g(0.2mol) of H2SO4 and 44.1g (3mol H2O) to simplify let's say that all the H2O will disapear first, then the H2S2O8, and no H2SO5 will be formed H2O --> H2 + 1/2 O2 at 0.25mol/h 24hours are needed then 2 H2SO4 --> H2S2O8 + H2 at 0.25mol/h 2hours are needed... i guees if some H2O2 is formed (H2S2O8 + 2H2O --> 2 H2SO4 + H2O2) it will disapear (H2O2 --> H2 + O2) and after 30 hours we would get pure H2SO4 by adding good amount of H2O and NaCl...
i try now i'll tell you the results (how many ml obtained, intensity compared to time and problems or not to keep the solution cold, mixing every hour)
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acx01b
(Newbee)
10-27-04 22:54
No 538264
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ok after 40hours 80% sulfuric acid has been...
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ok after 40hours 80% sulfuric acid has been obtained : )
joke I bought some 80% H2SO4 today at the drugstore: (by the way in every countries in brico stores you can find 75-80% H2SO4 for drain treatment) so let's try with 20mL of this acid: (density 1.7, 0.28mol of H2SO4, 0.38mol of H2O) H+ + 1e- --> H2 so 0.75mol of e- is needed to convert all the H2O to gaz, and 2 HSO4- --> H2SO8 + 2e-, so 0.55mol of e- is needed to convert all the H2SO4 to H2S2O8... I've a generator 12V, measured 0.5A = 0.18mol of e- per hour, I want to transfer 1.3mol of e- so 7 hours are needed...
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