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7. In order to determine the equilibrium constant for the reaction between Fe and SON a student prepared an equilibrium mixture of 10.00mL of 2.00 10 MF.00ml of 2.00 x 10M SCN7.00mL of 0.1M HNO, and (FeNCS") S of this mixture is 7.38 x 10 mol/L. Apply the rule for significant figures in the calculations a. Calculate (Fe. Zpoints b. Calculate (SCN) 2points Calculate Ke. 1 point d. Why the absorbance of the mixture is measured at 447 nm in the spectrophotometer. 1 point

Answer :

Final answer:

To calculate the equilibrium constant (Ke) for the reaction between Fe and SCN, you need to first determine the concentrations of Fe and SCN in the equilibrium mixture. The absorbance of the mixture is measured at 447 nm in the spectrophotometer because this wavelength corresponds to the maximum absorption of the FeNCS2⁺ complex.

Explanation:

To calculate the equilibrium constant (Ke) for the reaction between Fe and SCN, you need to first determine the concentrations of Fe and SCN in the equilibrium mixture. From the given information, you can calculate the molar concentrations of Fe and SCN using the volume and molarities provided. Next, use the equation Ke = [FeNCS2⁺] / ([Fe] * [SCN]) to calculate the equilibrium constant.

The absorbance of the mixture is measured at 447 nm in the spectrophotometer because this wavelength corresponds to the maximum absorption of the FeNCS2⁺ complex. By measuring the absorbance, you can indirectly determine the concentration of the FeNCS2⁺ complex, which allows for the calculation of the equilibrium constant.

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