Cool.
Don't worry, I didn't cover my experiment (for more then 30 minutes any way), so there was no explosion hazard.
I did however cover it for a short time with a dome shaped plastic thing. The result was, that the oxegen and hydrogen gatherd to the top and simply re-combined back to water in the form of water droplets on the plastic dome.
I used a 12v power box type thing (technicaly its 13.8v) that can put out 1.75amps.
Well I decided to put a electric motor into it and use it as the negative anode (I can't spell).
Since I wasn't doing electroplating, I don't think it would of matter which anode I put it on. The result was that the copper wiring inside the motor began to brake down and started to fill the container. The positive anode was a small screwdriver (its body was made of steel, with an Iron tip). Some of the copper (I think its copper, since it is the same color as it) began to collect on or near the screwdrive. But I don't think was electroplating, since the copper didn't stick to the screwdriver.
This time I used plain water (no salt though) to do the experiment.
Whats really cool, was that the motor still worked (well sort of, I had to take the core thingy and put it in a new motor body, and it work a little, but one coil was completly dead, out of 3. Which was because I recently wired it to a 120v AC power source. lol, man I'm stupid sometimes)
Now I am having fun using the 12v power source to re-charge 6 disposable batteries in series(the kind that arn't recharchable). I just do it to make them explode and leak and stuff. (though its not as violent as the battery companys want to you to think). AAA batterys explode much sooner then AA batteries, and much louder too. Thats what I learned from that one.
It normally takes about 30 min of charging to make at least one of the batterys explode. AAA batterys however exploded only after 5 minutes of charging!
Duracell batterys actually recharge pretty well, and got 30 min out of them using a portable cd player, then I would just recharge them again.
Even after the duracells exploded, they continued to hold a decent charge.
So if you want to recharge non-rechargeables, go with Duracells. lol.
P.S Don't worry, I handled the exploded batteries with extreme care, so I was at no risk of getting any battery acid on me.