Question

Why is the extraction of a metal ion into an organic solvent with more complete at higher ?

Short answer

In this task, let us explain the reason for the extraction of a metal ion into an organic solvent with $\mathbf{8}\mathbf{-}\mathbf{hydroxyquinoline}$ more complete at higher$\mathrm{pH}$

Step-by-step solution

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• First let us consider the following complexation reaction:

${\mathrm{mHL}}_{\mathrm{i}}+{\mathrm{M}}^{{\mathrm{m}}^{+}}\underset{}{\underset{,}{C}ML}im+{\mathrm{mH}}^{+}$

• Here, $\mathrm{HL}$ is a weak acid,${\mathrm{M}}^{\mathrm{m}+}$ is a metal in the aqueous phase.

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• When increasing the $\mathrm{pH}$, ${\mathrm{H}}^{+}$ from the solution gets eliminated.
• Then $M^{m+}$would react better with role="math" localid="1654837467576" $\mathrm{m}\mathrm{HL}$
• $\mathrm{m}\mathrm{HL}$becomes ${\mathrm{ml}}^{-}$when ${\mathrm{H}}^{+}$ gets eliminated from the solution.

Result:

$\mathrm{m}\mathrm{HL}$becomes ${\mathrm{ml}}^{-}$when${\mathrm{H}}^{+}$ gets eliminated from the solution.