25.00 mL 0.01000 M Ni2+ is titrated with 0.01000 M EDTA in a solution buffered to pH 5.0. Given that the formation constant for the Ni-EDTA (NİY?) chelate is 4.2 x 1018 and the a4 value at pH 5.0 is 3.54 x 10-7. (a) What is EDTA? (b) Explain briefly why EDTA is an important reagent used in complexometric titrations. (c) Calculate the conditional formation constant at pH 5.0. (d) Calculate the pNi at the equivalence point. An indicator (Ind) forms a metal-indicator complex with Ni (Nilnd), giving a (e) conditional fomation constant of 1.00 x 10 at pH 5.0. It is generally assumed that human eyes can detect about I part of one color in 10 parts of another; therefore, the first discermible color change will occur when the [Nilnd):[Ind] ratio changes from 10 to about 0.1. Calculate the approximate transition range of this indicator when used in the titration of Ni with EDTA at pH 5.0. ii. Judge whether this indicator would be suitable for titrating Ni" with EDTA at pH 5.0. Explain why.

25.00 mL 0.01000 M Ni2+ is titrated with 0.01000 M EDTA in a solution buffered to pH 5.0. Given that the formation constant for the Ni-EDTA (NİY?) chelate is 4.2 x 1018 and the a4 value at pH 5.0 is 3.54 x 10-7. (a) What is EDTA? (b) Explain briefly why EDTA is an important reagent used in complexometric titrations. (c) Calculate the conditional formation constant at pH 5.0. (d) Calculate the pNi at the equivalence point. An indicator (Ind) forms a metal-indicator complex with Ni (Nilnd), giving a (e) conditional fomation constant of 1.00 x 10 at pH 5.0. It is generally assumed that human eyes can detect about I part of one color in 10 parts of another; therefore, the first discermible color change will occur when the [Nilnd):[Ind] ratio changes from 10 to about 0.1. Calculate the approximate transition range of this indicator when used in the titration of Ni with EDTA at pH 5.0. ii. Judge whether this indicator would be suitable for titrating Ni" with EDTA at pH 5.0. Explain why.

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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