Electrolysis question

  • Thread starter plexus0208
  • Start date
  • #1
49
0

Homework Statement


Why does electrolysis of molten NaCl yield sodium and chlorine, while electrolysis of a solution of NaCl in water yields sodium hydroxide and chlorine.

Homework Equations



The Attempt at a Solution


Is it because H+ is more readily reduced than Na+?

2H+ + 2e --> H2 Eo= 0
2Cl- --> Cl2 + 2e Eo=-1.358

Thus, 2H+ + 2Cl- --> Cl2 H2 Eorxn=-1.358 V

And so 2H+ --> H2, leaving OH- behind in place of Cl-
 
Last edited:

Answers and Replies

  • #2
Borek
Mentor
28,600
3,078
Any ideas? You see, that template that you should use is not a joke, but a tool to force you follow forum rules.

--
methods
 
  • #3
49
0
Is it because H+ is more readily reduced than Na+?

2H+ + 2e --> H2 Eo= 0
2Cl- --> Cl2 + 2e Eo=-1.358

Thus, 2H+ + 2Cl- --> Cl2 H2 Eorxn=-1.358 V

And so 2H+ --> H2, leaving OH- behind in place of Cl-
 
Last edited:
  • #4
Borek
Mentor
28,600
3,078
Is it because H+ is more readily reduced than Na+?
Yes. Note that further discussion is irrelevant, as you should compare reduction potentials of H+ and Na+, chlorine reaction doesn't change.

--
methods
 

Related Threads on Electrolysis question

  • Last Post
Replies
2
Views
998
Replies
4
Views
3K
  • Last Post
Replies
1
Views
4K
  • Last Post
Replies
6
Views
6K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
2
Views
3K
Replies
1
Views
683
  • Last Post
2
Replies
28
Views
3K
Top