For EDTA Titrations the Titration Reaction Is Mⁿ⁺ + EDTA

question 17

Multiple Choice

For EDTA titrations the titration reaction is Mⁿ⁺ + EDTA ⇋ MY^n-4.Which statements are true for EDTA titration curves?
I At the equivalence point,there is exactly as much EDTA in solution as metal.[Mⁿ⁺] is calculated from the dissociation of MY^n-4 formed.
II After the equivalence point,the concentration free EDTA equals excess EDTA and virtually all metal ion is in the form MY^n-4.[Mⁿ⁺] is calculated from the dissociation of MY^n-4.
III Before the equivalence point,free [Mⁿ⁺] equals excess unreacted Mⁿ⁺ after EDTA has been consumed.Dissociation of MY^n-4 is negligible.
IV pM is plotted on the y-axis and milliliters EDTA solution added on the x-axis.

• A)I,II,and III
• B)I,III,and IV
• C)III and IV
• D)I,II,III,and IV
• E)II,III,and IV

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