CHEMENG 2G03 Study Guide - Microsoft Excel, Nernst Equation, Ph Meter

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Experimental work: wednesday, january 23rd, 2013 from 2:30 - 5:30 pm. The purpose of this lab is to determine the variation introduced with sampling methods, specifically concerning a ph sensor. By adding an acidic substance in a large water container, factors such as mixing and height of sampling can be examined. The glass ph sensor operates as a potentiometric electrode as it measures the voltage created from the hydrogen ions. [1] using the rearranged nernst equation we can relate ph with electric potential: Where the calibration electric potential (e"") and electric potential (e) has the units volts and the temperature (t) is represented in kelvin. Thus, the ph meter measures the electric potential and temperature, and outputs a varying value of ph. During the experiment, samples were taken every 120 seconds for three different heights and one pipette sample, and this was done for three trials.

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