Half reaction

[predentlove]

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Hi ! What are the half reaction for this equation:

2Al + 6HCl -> 2AlCl3 + 3H2

Thanks <3

 

[rockclock]

Hi ! What are the half reaction for this equation:

2Al + 6HCl -> 2AlCl3 + 3H2

Thanks <3

Oxidation states in brackets:

Al[0] + H[+1]Cl[-1] --> Al[+3]Cl[-1]3 + H[0]2

The ones that change are Al and H:

Oxidation: Al --> Al3+ + 3e-
Reduction: 2H+ + 2e- --> H2

 

[predentlove]

Thanks! So the Cl- is a spectator ion?

 

[predentlove]

Does a Positive standard electrode potential mean that the reduction/oxiation is ALWAYS exothermic?

 

[rockclock]

Thanks! So the Cl- is a spectator ion?

Yes.

 

[rockclock]

Does a Positive standard electrode potential mean that the reduction/oxiation is ALWAYS exothermic?

Yes, all galvanic cells (E > 0, dG < 0) are spontaneous and exothermic.