Please help!! My lab is due by midnight and I am completely lost! 1. The calcula
ID: 507585 • Letter: P
Question
Please help!! My lab is due by midnight and I am completely lost! 1. The calculated SCN- ion concentration in the standard solution (Explain!) 2. The slope of the Beer's Law Plot (Explain!) 3. The calculated equilibrium solution concentrations (explain!) 4. Calculated Keq (Explain)Date Post-Laboratory Questions se the spaces provided for the answers and additional paper if necessary.) When measuring the volumes of Fe(Nol, and NascN solutions in this experiment, a student mistakenly used a graduated cylinder instead of volumetric pipets. After collecting all the data, the student realized he'd used the wrong piece of equipment, but he didn't redo the experiment Also, he later realized that he had consistently misread the graduated cylinder and had thus transferred volumes that were actually 5% lower than the recorded volumes. Incorporate these measurement errors into the data for one of your equilibrium solutions, and recompute Kec for that solution. Determine whether the student's measurement errors would cause each of the following, as recalculated by you, to be higher than, lower than, or identical to the value you originally determined. Briefly explain.
Explanation / Answer
1.The calculated SCN- ion concentration in the standard solution (Explain!)
Answer : Actual concentraion will less than that calculated . As 5% less volume of SCN^- is used for titration.
2. The slope of the Beer's Law Plot (Explain!)
Answer : The slope of Beer's law plot is measure of extinction coefficient.This is constant for a complex. So, even if the concentration of the Fe(SCN)^2+ complex (you have less amount of complex as explained), you extinction coeffcient value will be same.
3. The calculated equilibrium solution concentrations (explain!)
Answer : SCN^- concentration is the limiting reagent as its amount is less. If you take less amount of SCN^- to begin with equilibrium concentration will be less
4. Calculated Keq (Explain)
Keq = [Fe(SCN)^2+]/[Fe^3+][SCN^-]
when you measure both Fe^3+ and SCN^- is lesser amount, their effect will enertually balance in the above equation. So, value of Keq will be same.