Feb 18, 2013
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Pre-Medical
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Straight from TPR. I picked C but the correct answer is A.

The answer explanation states that there is no oxidant to accept the electron from Cl- to give Cl2. I don't understand what this means. Can anyone explain this to me using that brief explanation or an easier explanation? Thanks.
 

DingoPingo

5+ Year Member
Jan 8, 2013
348
302
Status
Pre-Medical
Here's my take on it (may or may not be wrong). Because the reduction potential of K+ is negative, it will be oxidized (K --> K+). When K is oxidized, it releases electrons, which can be accepted by H+ to form H2 gas. In order for Cl- to form Cl2, it would need to give up electrons (aka be oxidized), but its oxidation potential is negative (-1.36V) and so will not oxidize spontaneously unless there is an oxidant with a reduction potential >1.36V.
 
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