I also think my numbers are messed up. For example, my results for data table 3 were 4.2x10^-4 M (FeSCN2+)eq, 5.8x10^-4 M (Fe3+)eq and .0016 M (SCN-)eq. When i solved for the K values in data table 3 with the equation K= Products/Reactants, my K value came around to 452. That seems a little off.....
Anyone have any suggestions or examples of what they think the correct data is?
-Mike
First, from the line of best fit equation, you can determine the FeSCN2+ concentrations. Remember that your y=mx equation generated by the line of best fit is really the beer's law equation: A=ebc where A is y, "eb" is m, and c is x. Therefore, if you plug in your measured absorbence in for y, you can solve for x, which will be the FeSCN2+ equation.
ReplyDeleteAlso, double check your Fe3+ and SCN- concentrations; they don't seem correct. Remember, using the DILUTED concentrations, you must subtract the FeSCN2+ value to determine the final concentrations to plug into your K eq. That being said, I remember the K value being between 100 and 200, but obviously that is somewhat dependent on your data, and execution of the lab.
Post if you have any more questions.
My Equation comes to be y=.0043x+.0022
ReplyDeleteDoes that Sound close?? The trendline is important to my success in the rest of the lab. If that is wrong then maybe i messed up earlier in the lab. I am getting my FeSCN2+ values to be around 5.87. Then when i find the Fe3+ equalibrium value, it comes out to be negative
-Mike