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Specialty Chemistry Forums => Chemical Engineering Forum => Topic started by: Blank on February 19, 2018, 10:25:44 PM

Title: E cell potential
Post by: Blank on February 19, 2018, 10:25:44 PM

Hi good day!
just want to ask this one.
I dunno if its me or my research ability is not enough but...
how come this Mn equals to -1.05??
I had been searching all standard potential values at 298K (starting from Atkins) and all they giving me is -1.18.
i tried to compute it and the value is giving me is around 0.47 to 0.48.
on our slide it goes with 0.6.its all because of that -1.05 value.

can you help me out on this one cuz really, I did all that I can but its giving me -1.05 for cell potential of E.
AM i wrong?
thank you so much.
I am not confident on my answer cuz u know, its my professor's answer after all.
Maybe there is some trick or whatsoever but I cant really find it.

here is the picture. thank you guys!!!

Title: Re: E cell potential
Post by: sjb on February 20, 2018, 01:13:07 AM

What is the definition of standard potential?

Title: Re: E cell potential
Post by: Borek on February 20, 2018, 02:59:43 AM

You post is so chaotic it is not clear what the problem is.

Do you mean the answer you have calculated doesn't agree with the answer given by your prof and you wonder if it is because the value he gave for Mn half potential is a wrong one?

Title: Re: E cell potential
Post by: Enthalpy on February 21, 2018, 04:47:25 AM

Could someone tell me under what circumstances Al³⁺ dissolves in water in 1.5M concentration?

Title: Re: E cell potential
Post by: Borek on February 21, 2018, 05:17:31 AM

Sodium alum?