2. In the same way, complete the columns for the initial concentrations of [Fe3+ Ji and [SCN-]I for Table 2 in Part C. Don't forget to show your work before filling the table in. Keep in mind that the total volume of each standard after dilution to the mark on the volumetric flask is 50.00 mL. Table 2 Calculations for reagents at Equilibrium с C Table 2 Calculations for reagents at Equilibrium Sample 0.00200 M 0.00200 M [Fe³+li [SCN-] i Fe(NO3)3 (mL) KSCN (mL) 1 2.0 8.0 2 4.0 6.0 3 5.0 5.0

2. In the same way, complete the columns for the initial concentrations of [Fe3+ Ji and [SCN-]I for Table 2 in Part C. Don't forget to show your work before filling the table in. Keep in mind that the total volume of each standard after dilution to the mark on the volumetric flask is 50.00 mL. Table 2 Calculations for reagents at Equilibrium с C Table 2 Calculations for reagents at Equilibrium Sample 0.00200 M 0.00200 M [Fe³+li [SCN-] i Fe(NO3)3 (mL) KSCN (mL) 1 2.0 8.0 2 4.0 6.0 3 5.0 5.0

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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7. Refer to the following table: Table 2-2. Change in pH of 0.2 M Acetate Buffer after addition of Acid or Base [Base]:[Acid] 0.005:0.195 Addition pH HC1 0.095 mol 3.1 HC1 0.075 0.025:0.175 3.9 HС1 0.05 НС1 0.025 0.05:0.15 4.2 0.075:0.125 4.5 0.1:0.1 0.125:0.075 4.7 NaOH 0.025 mol 4.9 NaOH 0.05 mol 0.15:0.05 5.2 NaOH 0.75 mol 0.175:0.025 5.5 NaOH 0.095 mol 0.195:0.005 6.3 a. Calculate the pH of a 0.2 M acetate buffer (a solution containing 0.1 mol L-' acetic acid and 0.1 mol L-1 sodium acetate), given that the pKa of acetic acid is 4.7. b. What would be the pH value after adding 0.05 mol of NaOH to 1 L of 0.2 mol L1 acetate buffer? c. Compare the pH value in (b) with that obtained after adding 0.05 mol NAOH to 1 L of water (a simple solution of 0.05 mol L-' NaOH). d. How much acid or base can be added to 1 L of the 0.2 M acetate buffer so that the pH does not change appreciably (i.e., what is its buffer range)?
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