1. You begin preparation of the calibration curve to measure absorbance vs conce

Question

1. You begin preparation of the calibration curve to measure absorbance vs concentration of FeSCN2+. To do so, you add 3.289 mL of 0.200 M Fe(NO3)3 to a cuvette and then directly add 98.989 µL of 0.001 M KSCN. What is the resulting concentration of FeSCN2+, assuming complete conversion of SCN- to FeSCN2+? Provide your response to four digits after the decimal; be careful with your exponent, it must complete this expression: __________ x 10-3M.

2. If the initial amount of Fe(NO3)3 transferred to the cuvette is 0.037 mol, and the absorbance measurements indicate that 0.011 mol of FeSCN2+ are present at equilibrium, what must be [Fe3+] at equilibrium? The total volume of solution in the cuvette is 2.497 mL. Provide your response to two digits after the decimal.

3. Under certain conditions, Kc for the iron thiocyanate system has a value of 134.09. If [Fe3+] = 0.048 M and [SCN-] = 0.04 M, what must be the concentration of FeSCN2+? Provide your response to three digits after the decimal: ____________ M

4. For the iron thiocyanate system, what is the value of the equilibrium constant, Kc, if the following are the concentrations of all species present. Provide your answer to three digits after the decimal.

Explanation / Answer

1. You begin preparation of the calibration curve to measure absorbance vs conce

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