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# lab8report - Carla Paulo Exercise 8 Determination of...

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Carla Paulo Exercise 8 Determination of Fluoride Purpose: To determine the F - ion content by using ion-selective electrodes. A salt, a commercial mouthwash, and tap water will be analyzed. Unknown #: 8D Mouthwash A: 0.05%(w/v) NaF 0.02%(w/v) F - Important Equations: E = E’ +2.303(RT/nF)log[M] μ = (1/2) Σ ZiCi Safety Factors: Sodium fluoride is harmful to skin and eyes. Inhalation can lead to fluoride poisoning. Wear gloves and goggles. Deionized water must be used. Raw Data: A. Preparation of Standards: Initial Mass of Vial (g) 25.5291 Final Mass of Vial (g) 25.1084 Total Mass of NaF (g) 0.4207g C. Potentiometric Analysis: Solution Potential (mV) 1 215.8 2 198.4 3 175.9 4 158.4 Solution Potential Unknown 157.5 Mouthwash 191.9 Tap Water 255.2 Treatment of Results:

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1. Calculate the standard NaF concentrations: Solution 1: 0.4207g NaF x (1mol NaF/41.99g NaF) x (1/0.100L) = 0.100 M NaF 0.100 M NaF x 0.010L = 0.001 mol NaF/0.100L= 0.01 M NaF 0.1 M NaF x 0.001L = 1x10 5 mol NaF/ 0.100L= 1.0x10
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## This note was uploaded on 12/07/2011 for the course CHEM 328 taught by Professor Soriaga during the Spring '10 term at Texas A&M.

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lab8report - Carla Paulo Exercise 8 Determination of...

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