Why is it necessar to use a large excess of Fe3+ when preparing the calibration standards? To ensure near quantitative formation of Fe(SCN)2+ To maximize the transmittance values To keep the volume constant To minimize the absorbance values
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The reaction of interest is the formation of $Fe(SCN)^{2+}$. Show more…
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(d) To minimize the uncertainty in a calibration curve’s slope and y-intercept, we evenly space our standards over a wide range of analyte concentrations and ensure that they encompass the likely concentration of the unknown. Why?
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Concentrations of Fe(SCN)2+ in Calibration Solutions: Recall that the concentration of Fe(SCN)2+ in the calibration solutions is essentially the concentration of the SCN- initially in the solution. So, determine the concentration of SCN- in each of the 10.0 mL calibration solutions. Calibration Solution: - 0.2 M Fe(NO3)3 in 0.5 M HNO3 - 0.002 M KSCN in 0.5 M HNO3 - 0.5 M HNO3 Blank Solution 1: - 5.0 mL Fe(NO3)3 - 0.5 mL KSCN - 4.5 mL HNO3 Solution 2: - 5.0 mL Fe(NO3)3 - 1.0 mL KSCN - 4.0 mL HNO3 Solution 3: - 5.0 mL Fe(NO3)3 - 1.5 mL KSCN - 3.5 mL HNO3 Solution 4: - 5.0 mL Fe(NO3)3 - 2.0 mL KSCN - 3.0 mL HNO3 Here are the results of the previous solutions when put through a spectrometer: Results: - Absorption Wavelength - Solution #1: 0.798, 451.2 nm - Solution #2: 1.176, 450.3 nm - Solution #3: 1.515, 452.9 nm - Solution #4: 1.868, 446.9 nm
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