Upgrade NaClO3 > NaClO4 failed : anode worn out ?
A few days ago I did a new attempt to make perchlorate, after a successful electrolysis a year ago. I started with table salt NaCl, dissolved 250 g in
0.8 liter water with a knife tip of K2S2O8. Then let the cell run for about 32 hours at 20 Amp, using an MMO anode with a temp up till 80 C. Then I
changed anodes, replaced the MMO anode by a PbO2 anode and let it run for 8-10 hours at 18 A and 70 C. The liquid I filtered out was slight yellow,
but clear.
But this time the methylene blue test did not result in purple precipitation, so it failed.
What did I wrong ?
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