Chemical Forums

Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: ChargePositive on March 08, 2019, 02:55:11 PM

Title: REPOST: Determining Equilibrium COnstant Post Lab Question
Post by: ChargePositive on March 08, 2019, 02:55:11 PM

*Re-posted because images did not show up*

Hello all,

So I've just done a lab where we prepare 5 different solutions of Fe3+, SCN-, and NO3. The concentration of SCN- was varied. At the end I calculated what the equilibrium constants are and am working on the post lab content. It asks me an " By what percentage did the initial concentration of SCN⁻ increase from smallest to highest?"

Now I don't know if I'm just being dense, but I have no idea what this means. I've attached my data tables as I'm pretty sure it has something to do with that.

I would be greatly appreciative if anyone could clear this up for me, thanks!

Lab Question (Green Highlight is what I'm Confused Abut)
(https://i.imgur.com/6odcyhT.jpg)

Table 2 - Initial Concentrations of SCN- of the 5 Different Solutions
(https://i.imgur.com/eGk2krf.jpg)

Table 3 - Equilibrium Concentrations of SCN- of the 5 Different Solutions
(https://i.imgur.com/jdjCLch.jpg)


IF IMAGES DO NOT SHOW: https://imgur.com/a/NyZn8w0 (https://imgur.com/a/NyZn8w0)

Title: Re: REPOST: Determining Equilibrium COnstant Post Lab Question
Post by: Borek on March 09, 2019, 03:33:48 AM

If the initial concentration in the first sample was 1, and in the last 3, that would mean increase by 200%, wouldn't it?