half reactions voltage multiplied?

[SuperSaiyan3]

i just can't seem to remember. this is frustrating since i should know it well by now.

When you have a half-reaction, such as Cu+2 + 2e- --> Cu E= -0.74V

And you were to use this half reaction to combine with some other half reaction to form a redox reaction, but your coefficients did not match, you need to multiply to get the right match right?

So when I do:

[ Cu+2 + 2e- --> Cu ] x -2 (to turn the equation around also)

do I do E = -0.74V x -2 also?

I can't seem to recall to save my life. I think the rule went that you can multiply by the positive or negative signs, but you can't multiple by numbers?

HELP! 😕

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[thebillsfan]

No, do not multiply the potential by the coefficient.

Does that mean potential is an "intensive" property, or does that sort of classification not apply?

 

[SuperSaiyan3]

No, do not multiply the potential by the coefficient.

Does that mean potential is an "intensive" property, or does that sort of classification not apply?

intensive? like an inherent characteristic? No idea, but I wouldn't worry about that sort of thing. Never heard of it.

So you can multiple it by -1 to switch the signs on the voltage but you can't multiply it by a coefficient?

Excellent. That's what I had in my mind.

Thanks!

 

[amine2086]

i just can't seem to remember. this is frustrating since i should know it well by now.

When you have a half-reaction, such as Cu+2 + 2e- --> Cu E= -0.74V

And you were to use this half reaction to combine with some other half reaction to form a redox reaction, but your coefficients did not match, you need to multiply to get the right match right?

So when I do:

[ Cu+2 + 2e- --> Cu ] x -2 (to turn the equation around also)

do I do E = -0.74V x -2 also?

I can't seem to recall to save my life. I think the rule went that you can multiply by the positive or negative signs, but you can't multiple by numbers?👍

HELP! 😕

Reduction potential is an intrinsic property. So reduction potential do not get multiplied by the coefficient when the equation is being balanced.

 

[matth87]

Reduction potential is an intrinsic property. So reduction potential do not get multiplied by the coefficient when the equation is being balanced.

Reduction potential doesn't change but remember if it is asking about # of electrons you still have to multiply that by the coefficient.

 

[Monkeymaniac]

Yes, electrical potnetial is an intensive property.