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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Mischief_Managed on May 20, 2016, 02:14:55 PM

Title: Eletrochemical reaction with HCl
Post by: Mischief_Managed on May 20, 2016, 02:14:55 PM

Can someone tell me how to calculate the electromotive force on this electrochemical cell

$ Pt(s) | Cl_2(g, 0.1atm)|HCl(aq, 0,5M) || HCl(aq, 0,1M| H_2(g, 0.5atm)|Pt(s)$

I guess it's the presence of HCl that is making me super confused... I don't how to write my reaction, to know which is the catode and which is the anode... Nothing!

Can someone just give a hint. Also the exercise gives us a list of potentials and I don't even know how to identify the ones I need. I just need a little push on how to start the problem, can someone help me????

$E^0(Cl_2/Cl^-)=1.359 V$

$E^0(Fe^{2+}/Fe)=-0.440 V$

$E^0(O_2, H_2O/OH^-)=0.402 V$

$E^0(O_2, H^+/H_2O)=1.229 V$

Title: Re: Eletrochemical reaction with HCl
Post by: Borek on May 20, 2016, 06:44:48 PM

Start with the gases present - they will be definitely parts of both half cells.