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Key exam_5 - EXAM#5 Fall 2007 NAME-k_S_y 1(10 points...

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__ --'-k_S_y EXAM #5 Fall 2007 NAME: _ 1. (10 points) ENCIRCLE the letter corresponding to the correct answer. 1. Which of the following operations would NOT lead to an incorrect pH reading using a glass electrode? (a) Measuring the pH of a basic solution with a high concentration ofNa+. @ sing a brand new electrode directly out of the box. (c) Calibrating and measuring pH at 40° C. (d) Measuring the pH of a highly concentrated strong acid 2. Which of the following statements is NOT TRUE in chromatographic separation: (a) The longer a component is retained by the column, the greater is the capacity factor. (b) The relative retention of two solutes is proportional to the ratio of their partition coefficients. @or quantitative analysis, a resolution ofless than 1.5 is highly desirable. (d) For a particular column, the smaller the plate height, the better the separations are. 3. Which of the following will NOT be useful as a reference electrode (a) saturated silver-silver chloride electrode (b) standard hydrogen electrode ~. saturated calomel electrode ~ Inert Pt electrode 4. To improve efficiency of a chromatographic separation, you must: @crease the number of theoretical plates on the column (b) increase the height of the theoretical plates on the column
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