plante1999 - 25-6-2012 at 13:50
Making persulphate with a platinum anode:
I have some difficulty finding potassium sulphate here, And I already tried to make it with potassium chloride and sulphuric acid, but at the end of
the synthesis you need to heat quite a lot your glassware, in a test tube I found this reaction quite easy, but I tried in a 250ml filtration flask,
and a bump broke it, I was quite frustrated when it happened. So if I don't find something to replace the glass ''ware'' I will try to use potassium
alum, with sulphuric acid in excess instead. The excess sulphuric acid reacting with The aluminium hydroxide produced at the cathode. So overall only
efficiency would be lowered and persulphate would be make. What do you think?
2KAl(SO4)2 + (excess)2H2SO4 -) 2KHSO4 + Al2(SO4)3
2KHSO4 -(electrolysis)-) H2 + K2S2O8
Overall:
2KAl(SO4)2 + (excess)2H2SO4 -(electrolysis)-) K2S2O8 + Al2(SO4)3
Thanks!!