# Quick Half equation question:Watch

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Thread starter 8 years ago
#1
i) Give the ionic half equation for the formation of fluoride ions from fluorine gas.

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The answer in the mark scheme is:
F2 + 2e- > 2Fe-

Just wondering if you could do :
F2 > F + 2e-

As in it doesn't accept electrons, it gives them out to form positive ions ?
0
8 years ago
#2
Fluoride is the anion by definition, so no you can't do your equation.
0
8 years ago
#3
The fluoride ion is F- by definition, hence in order to become that from F2, you need to add two electrons (one to each fluorine atom) in order to become F-.
0
3 years ago
#4
gi
0
3 years ago
#5
u all
0
3 years ago
#6
(Original post by Tulian)
i) Give the ionic half equation for the formation of fluoride ions from fluorine gas.

------------------------------
The answer in the mark scheme is:
F2 + 2e- > 2Fe-

Just wondering if you could do :
F2 > F + 2e-

As in it doesn't accept electrons, it gives them out to form positive ions ?
The oxidation state of Fluoride is always -1, therefore it will always gain an electron. Hence you equation is wrong. Plus what you did is not balanced either, Florine is diatomic :s
0
3 years ago
#7
(Original post by Asad_2015)
The oxidation state of Florine is always -1, therefore it will always gain an electron. Hence you equation is wrong. Plus what you did is not balanced either, Florine is diatomic :s
What's the oxidation state of Fluorine in this compound: F2?
0
3 years ago
#8
(Original post by alow)
What's the oxidation state of Fluorine in this compound: F2?
0 lol, should have said fluroide, my bad 😂
0
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