Let's say you have a solution of NaCl and place an anode and a cathode into
it. Ordinarily you'll get chlorine evolving at the anode and hydrogen at
the cathode.
What if you sealed the anode in (insulating) polyvinyl chloride? Would the
PVC convert to chlorinated polyvinyl chloride and liberate
PVC has good resistance to HCl and to chlorine gas, but not to the ion.
However, negative ions being attracted to the surface of an anode is not enough
to cause current to flow, as the ions must actually remove electrons for that
to happen. Until current flows, there will be no hydrogen release
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