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Asked Jan 7, 2020
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 >Why does the electrolysis of an aqueous sodium chloride solution produce hydrogen gas at the cathode? 

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Expert Answer

Step 1

In electrolysis of aqueous solution of NaCl, the solution would simply result in the electrolysis of water, producing oxygen gas at the anode and hydrogen gas at the cathode.  If we construct such a cell, we find that although hydrogen gas is indeed formed at the cathode, oxygen gas is not formed at anode, instead of it, chlorine gas is formed. This is explained as follows. 

Step 2

At cathode: reduction rea...

Chemistry homework question answer, step 2, image 1
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