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At higher pH values, the fraction of species for EDTA 4- increases because more

ID: 873067 • Letter: A

Question

At higher pH values, the fraction of species for EDTA4- increases because more H+ are available, which helps EDTA act as a stronger acid.              T          F

The concentration of EDTA4- in the solution is related to all the forms of EDTA in the solution via the following equation: ?[EDTA4-] = CEDTA         T         F

H2EDTA2+ is only present in a solution of EDTA if the pH is very low.                                                                                                                              T          F

At the equivalence point in an EDTA - metal ion titration, the concentration of the metal ion is zero.                                                                                T          F

If the ?EDTA4- is small, the K'f may also become too small for a successful titration.                                                                                             T          F

Explanation / Answer

The 2nd and 4th statements are TRUE

The 1st and 3rd statements are FALSE

The reason for being at higher pH value, the edta didn't tend to loose H+ easily which will make the conc of H+ less in acidic medium hence first statement is false

The third statement is false since the conc will be in equilibrium value and not at zero

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