electrochemistry question

[yingao]

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During the electrolysis of an aqueous solution of KCL, what is produced at the cathode?

1. K(s)
2. Cl2 (g)
3. H2(g)
4. O2(g)

 

[BeatMCAT]

umm i would suggest H2 gas is formed at the cathode and cl2 gas at anode. is that right?

 

[yingao]

umm i would suggest H2 gas is formed at the cathode and cl2 gas at anode. is that right?

Yes, but what is the reason? THX!

 

[Rom1pd]

You have reduction at the cathode.. Cl- to Cl2 would not be a reduction... K is too reactive in aqueous solution, and you dont see any Os in this question -> H2. H+ ions getting reduced

 

[BeatMCAT]

During the electrolysis of an aqueous solution of KCL, what is produced at the cathode?

1. K(s)
2. Cl2 (g)
3. H2(g)
4. O2(g)

The reason is that the rxn taking place is water + cl- --> h2 + cl2 + 2OH-

if oyu look at it, water is getting reduced to h2. therefore at cathode where reductions occur, h2 gas will be produced. and at anode, cl2 gas will be produced as cl- is oxidized to cl2.

 

[yingao]

thx a lot!!