A metal ion buffer used for calibrating an ion-selective electrode is prepared u

Question

A metal ion buffer used for calibrating an ion-selective electrode is prepared using 0.0450 M of a metal-ligand complex (ML) and 0.0263 M of the free ligand (L). The formation constant, Kf, for ML is 7.22 × 107. Calculate the concentration of free metal ion (M) in the buffer.

A metal ion buffer used for calibrating an ion-selective electrode is prepared using 0.0450 M of a metal- ligand complex (ML) and 0.0263 M of the free ligand (L). The formation constant, Kf, for MLis 7.22 x 107 Calculate the concentration of free metal ion (M) in the buffer Number M M

Explanation / Answer

M +   L <--> ML

Kf = [ML] /[ M] [L]

7.22 x 10^7 = (0.045 ) / ( [M] ( 0.0263)

[M] = 2.37 x 10^ -8 M

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