Given The Following Data Calculate The Equilibrium Constant As Illustrated In The Example Calculation On Pages 1 3 1 (156.39 KiB) Viewed 115 times
Given the following data, calculate the equilibrium constant, as illustrated in the example calculation on pages 1 - 3. Data 175 Post-Lab No post lab Safety (deduction) Legibility (deduction) Tardiness (deduction) TOTAL /100 The regression line from the calibration was: A = 4066[FeSCN2+] + 0.025 A sample is mixed following the dilution pattern of: Substance Stock solution of Fe3+ (aq) Stock solution of SCN- (aq) Water Concentration 1.98 x 10-3M 2.02 x 10-3 M Amount Added to Mixture 5.02 mL 5.00 mL 2.00 ml The student was trying to mix 5 mL: 5 mL: 2 mL, but was off a little, so she recorded the actual volumes used. The absorbance reading of this sample was: A = 0.401 1. Use the regression line to calculate [FeSCN2+] (or “x” on the ICE table) Show the calculation: x= equilibrium concentration of FeSCN2+ (aq) = M 2. Using the dilution equation, calculate Co and C.' Co = initial concentration of Fe3+ (aq) M Co'= initial concentration of SCN- (aq) M Show calculations:
3. Calculate the equilibrium concentrations of Fe3+ (aq) and SCN- (aq) Co - x = equilibrium concentration of Fe3+ (aq) = M Co'- x = equilibrium concentration of SCN- (aq) M Show calculations: 4. Calculate the equilibrium constant: [FeSCN2+] [Fe3+][SCN-] [x] [Co – x][C6 – x] = K (Eq.4) Show calculations: K=
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