In order to determine the selectivity of the Ca 2+ ion selective electrode (ISE)

Question

In order to determine the selectivity of the Ca2+ ion selective electrode (ISE) with respect to Mg2+ ions, the ISE was placed in two different solutions at room temperature:

Solution                         Concentration (mM)                 E(mV)

MgCl2                               0.01                                           -45.3

CaCl2                               0.001                                          11.8

What is the selectivity coefficient of the ISE with respect to magnesium that you can determine from the data above?

Explanation / Answer

From the data above, Ca2+ ions are the selectivity coefficient of the ISE.

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