Abstract
In our extended experimental work with aqueous solutions of NaHCO3 we noticed higher electrical conductivity in aged solutions in comparison to the conductivity of chemically analogous fresh (one day old) solutions. The phenomenon was found in solutions left undisturbed for longer time (∼ 1 year). Most probably the dissolved ions as well as the contact with hydrophilic surfaces play the essential role. We found that higher conductivity is proportional to higher surface vs. volume ratio.
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