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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Bushiobrao on March 17, 2021, 06:53:16 PM

Title: Calculate concentration ratio
Post by: Bushiobrao on March 17, 2021, 06:53:16 PM

Hello,

If we have the half-reactions:

Fe3++e- -> Fe2+
and
2H+ + 2e- -> H2

Calculate the ratio [Fe3+] / [Fe2+] at pH 2. Any hint? I was immediately thinking standard electrode potentials as we have two half reactions, but not sure exactly how to go on..

Title: Re: Calculate concentration ratio
Post by: Borek on March 18, 2021, 04:15:38 AM

Hint: at equilibirum both reaction potentials must be identical.