Concept: During the first week of this project, you will prepare a standard curv
ID: 962607 • Letter: C
Question
Concept:
During the first week of this project, you will prepare a standard curve to determine the concentration of Fe(SCN)2+ complex at equilibrium. The standard curve is made by plotting the absorbance (y-axis) versus concentration (x-axis) of the red Fe(SCN)2+complex. Based on Beer’s law, the standard curve should be a straight line. Therefore, the concentration of Fe(SCN)2+ complex with a known absorbance can be calculated using the standard curve.
Read the supplementary material named “Supplementary- Chem Equilibrium Method I”, and answer Questions 2 and 3. (The pdf file of the supplementary material should be on Canvas under “Files”. Otherwise, please consult with your TA about the file.)
Question:
Which statement about the standard curve or the equilibrium concentration Fe(SCN)2+ complex is NOT correct?
When the initial concentration of Fe3+ is much larger than that of SCN, SCN is the limiting reagent.Explanation / Answer
Answer is
When R2 is 0.25, the equation of the trendline applies well to all of the data points
Since for a straight line, R2 should be 1 or nearly equal to 1.
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