Multiple Choice
Find the concentration of free Na + in 0.15 M Li 3[Na(EDTA)] at pH = 10.00.
11. EDTA Titrations
EDTA
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Determine the pH where αY4– equals 0.20.
A
pH ≈ 11.1
B
pH ≈ 12.5
C
pH ≈ 9.80
D
pH ≈ 9.00
Verified step by step guidance1
Identify the species of interest, Y^{4-}, and its fractional composition, \alpha_{Y^{4-}}, which is given as 0.20.
Examine the provided graph of EDTA species as a function of pH. Locate the curve corresponding to Y^{4-}.
Find the point on the Y^{4-} curve where the fractional composition is 0.20. This is the value of \alpha_{Y^{4-}}.
Trace vertically from this point on the Y^{4-} curve to the x-axis to determine the corresponding pH value.
Verify that the pH value you have identified is consistent with the given options and the correct answer provided, which is pH ≈ 9.80.
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