The partition coefficient is modified when the pH of the aqueous phase is adjusted or when a chelating agent is added.The partition coefficient is renamed the distribution coefficient.What is the impact on the extraction of a weak acid into an organic solvent as the pH of the aqueous phase increases?
A)As the pH increases the value of D decreases and the percentage weak acid left in the aqueous phase decreases.
B)As the pH increases the value of D increases and the percentage weak acid left in the aqueous phase increases.
C)As the pH increases,the value of D decreases and the percentage weak acid left in the aqueous phase decreases.
D)As the pH increases the value of D increases and the percentage weak acid left in the aqueous phase decreases.
E)As the pH increases the value of D decreases and the percentage weak acid left in the aqueous phase increases.

Question

Quizplus · Accepted Answer

As the pH of the aqueous phase increases, weak acids tend to ionize more, making them more soluble in the aqueous phase and less likely to partition into the organic phase. This results in a decrease in the distribution coefficient (D) because the concentration of the acid in the organic phase decreases relative to the aqueous phase. Consequently, a higher percentage of the weak acid remains in the aqueous phase.

The Partition Coefficient Is Modified When the PH of the Aqueous