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Unformatted text preview: ISE to determine weight percentage sodium in bag of pretzels Abstract ISE was used to determine the percent of sodium in a bag of pretzels. The amount of sodium in the bag of pretzels is 1.8 grams over 42.5 grams total with an error of 0.08, more than the amount proclaimed by the bag of pretzels which is 0.350 grams. Introduction Ion Selective Electrodes (ISE) are membrane electrodes that respond selectively to ions in the presense of others. These include probes that measure specific ions and gasses in solution. The most commonly used ISE is the pH probe. Other ions that can be measured include metals (Floride, Chloride, Bromide, Cadmium, and Cupric to name a few) and gasses in solution such as ammonia, carbon dioxide, nitrogen oxide, and oxygen. Ion Selective Electrodes (including the most common pH electrode) work on the basic principal of the galvanic cell (Meyerhoff and Opdycke). By measuring the electric potential generated across a membrane by "selected" ions, and comparing it to a reference electrode, a net charge is...
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- Fall '11