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Strongest Reducing Agent?

#chemistry #reducingagent

Why is Zn(s) the strongest reducing agent among Cr(s), Fe²⁺(plus 2 charge)(aq), Zn(s) and H₂(g)?

Answers (1)

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The strongest reducing agent is always the chemical that most freely volunteers to give up at least 1 electron.

The electrons for the reducing agents are ALWAYS on the right hand side of an equation of a redox equation. So Zinc for example looks like this

Zn ===> Zn2+ + 2e-

If you are in a chemistry class where you have learned this for the first time, then the reason why Zn is the best reducing agent is just that when you go into the lab

Zn + Fe+2 ====> Fe + Zn+2

Happens so much easier (if the equation below will happen at all) than

Zn+2 + 2Fe+2 ====> 2Fe+3 + Zn

If you go beyond this simple explanation and you are actually in an advanced physical chemistry class, then this answer is totally inadequate.

I guess the only reason I can give is "Because the Lab says so," which might be just as unsatisfactory an answer now as it was when you first heard your mum say "Because I say so," when you were little.

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