Here is some electrochemistry data:
http://www.nyu.edu/classes/tuckerman..._26/node5.html
This shows that it only takes about 1.229 volts to electrolyze water to H2 and O2 at 1 atm.
Other data from various sources:
K(+) + e- -> K, E = -2.93 volts
Na(+) + e- -> Na, E=-2.71 volts
Eu(+3) + 3e- -> Eu, E= -2.41 volts
Eu(+3) + e- -> Eu(+2), E= -0.37 volts
This other data shows that at 12 volts water will electrolyze easily but as long as there is water there to electrolyze the other things like K(+), Na(+) and Eu(+3) will not plate out of solution so either of them could be used but what is KOH going to do other than enhance conductance of current through the cell (I note K(+) is actually one of the best conducting positive ions). Note that it only takes 0.37 volts to reduce Eu(+3) to Eu(+2) and that is within the voltage of the 1.229 volts that is electrolyzing the water so that can be going on during the water dissociation. Therefore, while I do not really know what "Catalyst" is in the powder given with some kits, the idea of EuCl3 should be a possible catalyst. Maybe just KOH is worth the added conductivity but I see no other catalytic function of the KOH. As to R. Pope's analysis it means that mooneye777 needs to keep a better log of the amount of water used for how many miles traveled. I have no doubt that SOME (H2 + O2) is formed, but as R. Pope says it seems like a small amount. Since O2 is formed we should also consider the effect of the O2 sensor in the Saturn. This stuff is exciting and interesting but may turn out to be just a pointless roller coaster of hope and disappointment. Still I am willing to keep considering it and I hope Mooneye777 will provide more data.
Don Shillady
Retired Scientist/teen rodder