For electrolysis of very dilute sodium chloride, H+ and OH- are discharged at cathode and anode respectively to give hydrogen and oxygen. So the concentration of H+ and OH- decreases, while the concentration of Na+ and Cl- increases.
My question is: will the Cl- be discharged after sometimes due to concentration effect, as the OH- concentration decreases and Cl- increases?
Electrolysis
2011-02-08 11:38 pm
回答 (2)
2011-02-09 1:26 am
✔ 最佳答案
First at all, due to the autoionization of water, the concentration of H+ and OH- will remain about constant. In fact, in constant temperature, the product of concentration of H+ and OH- will be a constant. So even H+ and OH- discharged, there will be some more H+ and OH- formed from ionization of water. But during such process, water is consumed. If sufficient amount of water is consumed, the Cl- will be concentrared and maybe concentrate enough to discharge. But this will not be so likely to occur as after Cl- discharged, the concentrarion of Cl- will drops
2011-02-09 12:23 am
I use English to study chem -_- dunno how to express in Chinese
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