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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Ralphguy on July 30, 2021, 02:02:40 AM

Title: Equilibrium Concentration Need Help
Post by: Ralphguy on July 30, 2021, 02:02:40 AM

Hi, I have been trying to figure this out for the past five hours. I still don't understand how I can solve for Keq (Equilibrium Constant) with the following data. When I try to solve for Keq, my denominator will just become 0 because of my [SCN-] is 0 M. Could there have possibly been an error? or do I just disregard the 0 M?

Thanks in advance.

Edit:
The reaction equation is Fe3+(aq) + SCN–(aq) ⇄ FeSCN2+(aq)

Title: Re: Equilibrium Concentration Need Help
Post by: Borek on July 30, 2021, 04:16:47 AM

Something is wrong with these numbers, where you got them from?

Title: Re: Equilibrium Concentration Need Help
Post by: Ralphguy on July 30, 2021, 04:26:04 AM

Hi, I also have the same thought, but I just followed whatever the professor taught us through a 9-minute video. The professor told us to apparently subtract the moles of SCN- to Fe3+ to get the equilibrium moles of Fe3+. I am genuinely very confused right now even the top students in my class are getting the same results that I got.

Title: Re: Equilibrium Concentration Need Help
Post by: Ralphguy on July 30, 2021, 05:02:52 AM

Quote from: Borek on July 30, 2021, 04:16:47 AM

Something is wrong with these numbers, where you got them from?

I think I finally figured it out. I just followed what my primary chemistry professor taught me. Thank you so much for pointing out that the figure was incorrect.