You are watching: Which of the reactions are spontaneous as written.
mikeRetired StaffSr. Member
Posts: 1246Mole Snacks: +121/-35Gender:
If the reduction potential is positive it is spontaneous in the direction written. If the reduction potential was negative the reverse reaction would be spontaneous.
lucasloredoNew MemberPosts: 8Mole Snacks: +0/-0
Thanks for the quick reply, but I'm still a bit confused. So, for instance, the reduction potential for the first half reaction, as I wrote it, is –0.54v, so does that make the whole equation spontaneous? I am very confused
Could you please elaborate a little further? We just learned this concept a couple days ago and I'm still not comfortable with the material.Thanks again,Lucas
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Remember that reduction is a gain in electron (OILRIG - oxidation is loss/reduction is gain).So reduction potentials are for the reaction in the reduction direction, if you reverse the reaction (like you did with iodine) it becomes an oxidation reaction.The reaction with the higher more positive reduction potential will proceed spontaneously in the reduction direction when reacted with another compound with a smaller reduction potential (in which case it will proceed in the oxidation direction).