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 0.0366 M of a metal-ligand complex (ML) and 0.0258 M of the free ligand (L). The formation constant, Kf, for ML is 6.75 × 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 0.0366 M of a metal- ligand complex (ML) and 0.0258 M of the free ligand (L). The formation constant, Kf, for ML is 6.75 x 107 Calculate the concentration of free metal ion (M) in the buffer. Number IM) M

Explanation / Answer

M + L <-----> ML

Kf = [ML]/[M][L]
6.75*10^7 = 0.0366 / (0.0258 ) [L]
[L] = 2.10*10^-8 M

Answer: 2.10*10^-8 M

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