1. From a plot of your calibration data, the slope is found to be 31.5. What wil
ID: 807398 • Letter: 1
Question
1.From a plot of your calibration data, the slope is found to be 31.5. What will be the concentration of your absorbing species in a solution that has an absorbance of 0.446?2. Using the equilibrium reaction that you are using in your experiment, a student measures out initial concentrations of 0.00135 M Fe3+and 0.00485 M SCN-. If the equilibrium value of Fe(SCN)2+ is found to be 0.00049 M, what is the equilibrium concentrations of Fe3+. Give all anwers to questions in standard (not scientific) notation.
3. Using the equilibrium reaction that you are using in your experiment, a student measures out initial concentrations of 0.00193 M Fe3+and 0.00411 M SCN-. If the equilibrium value of Fe(SCN)2+ is found to be 0.00045 M, what is the value of Kc. Give all anwers to questions in standard (not scientific) notation.
1.From a plot of your calibration data, the slope is found to be 31.5. What will be the concentration of your absorbing species in a solution that has an absorbance of 0.446?
2. Using the equilibrium reaction that you are using in your experiment, a student measures out initial concentrations of 0.00135 M Fe3+and 0.00485 M SCN-. If the equilibrium value of Fe(SCN)2+ is found to be 0.00049 M, what is the equilibrium concentrations of Fe3+. Give all anwers to questions in standard (not scientific) notation.
3. Using the equilibrium reaction that you are using in your experiment, a student measures out initial concentrations of 0.00193 M Fe3+and 0.00411 M SCN-. If the equilibrium value of Fe(SCN)2+ is found to be 0.00045 M, what is the value of Kc. Give all anwers to questions in standard (not scientific) notation.
2. Using the equilibrium reaction that you are using in your experiment, a student measures out initial concentrations of 0.00135 M Fe3+and 0.00485 M SCN-. If the equilibrium value of Fe(SCN)2+ is found to be 0.00049 M, what is the equilibrium concentrations of Fe3+. Give all anwers to questions in standard (not scientific) notation.
3. Using the equilibrium reaction that you are using in your experiment, a student measures out initial concentrations of 0.00193 M Fe3+and 0.00411 M SCN-. If the equilibrium value of Fe(SCN)2+ is found to be 0.00045 M, what is the value of Kc. Give all anwers to questions in standard (not scientific) notation.
Explanation / Answer
1. Calibration curve of absorbance measurements is a straight line passing through origin. Therefore, absorbance*slope = concentration 0.446*31.5 = 14.049 (Units? not given )
2. At equilibrium [Fe3+] = 0.00135 - 0.00049 = 0.00086 M or 0.86 mM
3. Kc = 0.00045/(0.00193-0.00045)*(0.00411-0.00045) = 83.075
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