11. EDTA Titrations
EDTA Titration Curves
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Calculate the pNi2+ for the titration of 50.0 mL of 0.120 M EDTA with 15.0 mL of 0.100 M NiCl2 at pH = 8.22.
A
1.90x10-17
B
17.7
C
16.7
D
17.4
Verified step by step guidance1
Determine the initial moles of Ni2+ by multiplying the volume of NiCl2 solution (in liters) by its molarity.
Calculate the initial moles of EDTA by multiplying the volume of EDTA solution (in liters) by its molarity.
Identify the limiting reagent by comparing the initial moles of Ni2+ and EDTA, as they react in a 1:1 molar ratio.
Calculate the concentration of the Ni2+-EDTA complex formed, considering the volume change after mixing the solutions.
Use the stability constant (Kf) for the Ni2+-EDTA complex to find the concentration of free Ni2+ ions, and then calculate pNi2+ as the negative logarithm of this concentration.
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