A target analyte A has a pk, value of 7.00 while the interferent B has a pKa value of 2.00. A mixture of A and B in water was extracted with diethyl ether. If A and B have almost the same value of distribution coefficient, which of the following will ensure higher extraction of A in the organic phase?

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter28: Atomic Spectroscopy
Section: Chapter Questions
Problem 28.13QAP
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answer both correctly, no need for long explanation
A target analyte A has a pkb value of 7.00 while the interferent B has a pka
value of 2.00. A mixture of A and B in water was extracted with diethyl ether. If
A and B have almost the same value of distribution coefficient, which of the
following will ensure higher extraction of A in the organic phase?
Select one:
O A. Add HCI in the aqueous phase
O B. Add NaOH in the aqueous phase
O C. Set the pH of aqueous phase at 7.00
O D. Set the pH of aqueous phase at 2.00
All of the following equilibrium reactions have a direct effect on the distribution
coefficient D in metal-ligand extraction using dithizone ligand except:
O A. M2*aq + 2(H-dithizone)aq → [M(H-dithizone),]²*aq
O B. H-dithizoneaq → dithizone aq + H*aq
O C. H-dithizoneaq → H-dithizoneorg
O D. M2*aq + 2(dithizone)aq → [M(dithizone)2laq
Transcribed Image Text:answer both correctly, no need for long explanation A target analyte A has a pkb value of 7.00 while the interferent B has a pka value of 2.00. A mixture of A and B in water was extracted with diethyl ether. If A and B have almost the same value of distribution coefficient, which of the following will ensure higher extraction of A in the organic phase? Select one: O A. Add HCI in the aqueous phase O B. Add NaOH in the aqueous phase O C. Set the pH of aqueous phase at 7.00 O D. Set the pH of aqueous phase at 2.00 All of the following equilibrium reactions have a direct effect on the distribution coefficient D in metal-ligand extraction using dithizone ligand except: O A. M2*aq + 2(H-dithizone)aq → [M(H-dithizone),]²*aq O B. H-dithizoneaq → dithizone aq + H*aq O C. H-dithizoneaq → H-dithizoneorg O D. M2*aq + 2(dithizone)aq → [M(dithizone)2laq
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