Test-exam 2

D in the paper it is shown that when the response is

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Unformatted text preview: std (x-axis).* Ans. For the correct answer for ‘e’, see page 3 of Zellmer’s paper – “If we wish to use the more traditional standard addition approach using an x-axis intercept, then when y=0, the x-axis intercept will be at x b m or CstdVstd CunkVo . Divide the amount CstdVstd at the x-axis intercept by Vo and you have Cunk.”. 20. Using the following data, 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 A B C Ion Selective Electrode - Fluoride Direct Potentiometry Standard Solutions: C (mg/L) 0.5 1.0 2.5 5.0 100.0 300.0 Sample Solutions: Toothpaste Tap Water Mass of Toothpaste used (g) D E F G H I J K L M logC -0.30 0.00 0.40 0.70 2.00 2.48 E mv 112.8 95.9 72.7 55.3 -20.7 -47.0 150.0 100.0 E, mV 50.0 0.0 0.00 -50.0 Plot E (y-axis) versus logC (x-axis) here Standard Curve y = -57.793x + 95.624 R2 = 1 -0.50 60.5 125.0 0.2 0.50 1.00 1.50 2.00 2.50 3.00 -100.0 LogC Linear Least Square Analysis: Slope Intercept Toothpaste logC Tooth...
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