assignment6

assignment6 - Assignment: Ion Selective Electrode 1 Ion...

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Assignment: Ion Selective Electrode 1 Ion Selective Electrode - Fluoride MSDS : NaF This should be included in the EXPERIMENTAL section. The following items should be included, if possible. Hazards : Handling & Storage : Disposal : SAMPLE CALCULATIONS: 1. Show how the results are determined using direct potentiometry method. 2. Show how the results are determined using standard addition method. PRELABORATORY QUESTIONS : 1. Light and Cappucinno’s article gives a list of different brands of toothpaste in table 4 on page 250. For brands A, C, F, I, and K calculate the fluoride ion concentration in ppm. Brand Sample Wt. (mg) ppm-F A 227.1 C 212.9 F 211.0 I 230.6 K 203.7 2. Why should fluoride solutions be stored in plastic bottles rather than glass? 3. What is the source of the potential of a crystalline membrane electrode used to determine the concentration of the fluoride ion? 4. Do all the problems in WebCT Lab Manual Ion Selective Electrode Supp – Fluoride. 5. With the help of the equations shown in “Exp 0 – Self Study Exercise” and the values given in David Zellmer’s paper, duplicate the two spreadsheets shown in the paper. If the numbers do not come out to be exactly the same, explain what is the possible reason.
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This note was uploaded on 10/28/2010 for the course CHEM 100A taught by Professor Dai during the Winter '06 term at UCSD.

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assignment6 - Assignment: Ion Selective Electrode 1 Ion...

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