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Unformatted text preview: __--'-k_S_yEXAM #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 (c) increase both the number and the height of the theoretical plates on the column....
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