Explain the Coordination Chemistry and Chemical Speciation Utilized in the Analy

Question

Explain the Coordination Chemistry and Chemical Speciation Utilized in the Analysis of Fluoride in Water Samples by Fluoride Ion-Selective Electrode.

The portion of this I am struggling to answer is Coordination Chemistry. My professors response of what I'm missing that needs to be incorporated into the answer was that it "should include chemical equations.The question asks about the coordination Chemistry. Chemists use equations to discuss the chemistry involved in processes. There is acid base chemistry , electrochemistry, coordination chemistry and chemical speciation." I am just a bit lost... Any help is appreciated, thank you!

Explanation / Answer

Fluoride Ion-Selective electrode (ISE) is based on a crystal of lanthanum fluoride (LaF3) doped with europium, Eu(II), at the level of approximately 1% to create crystal defects to improve conductivity. ISE's work on galvanic cell principal. The electric potential generated across a membrane by "selected" ions is compared to a reference electrode. The strength of the charge created is directly proportional to the concentration of the selected ion and the basic formula is given by,

Ecell = Eise - Eref
(potential for the cell) = (potential of the ISE) - (reference potential)

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