« on: 20/06/2010 04:36:12 »
The separation of salt from water can be done by distillation.
Isn't the evaporation process is part the same?
If the small concentrate was good enough in the initial setup, what happened to the salt?
It always had me perplexed
I was thinking .. it is still there, but it had dried to the walls of the reservoir and something physical about the way it is sticking to the reservoir, something is not permitting it to dissolve into the replenished water.
"Electrolysis of Sodium Chloride Solution
Cautious electrolysis of NaCl solution with the Brownlee apparatus will produce hydrogen plus aqueous NaOCl if the experiment is carried out in a single, unpartitioned jar with stirring. What happens first is that hydrogen, chlorine, and NaOH are produced, and the aqueous chlorine and NaOH then react to form NaOCl ("bleach"). Higher temperature, however, tends to produce ClO3- (aq.) instead of OCl- (aq.). Running the electrodes in two separate partitions will produce gaseous chlorine (poisonous!) and hydrogen, plus aqueous NaOH.
Some chlorine will undoubtedly escape the hypochlorite cell and go into the air without being consumed, so this whole operation should be done in a fume hood or outdoors. The odor of chlorine is sharp enough that, if it escapes into the room, you should have sufficient warning to shut off the power supply and get out of the area before there's any injury."
The above refers to DC current flow. I think these humidifiers apply AC across the electrodes, so that will change things somewhat.