5· The same so.0mL buret is used to deliver five 350ml. aliquots of a solution t

Question

5· The same so.0mL buret is used to deliver five 350ml. aliquots of a solution to separate flasks. What is a source of imprecision in these measurements? The buret has an imperfection on the inside at about the 10.0 mL mark. (A) The buret has a linear volume scale printed on it, but the diameter of the buret tube decreases linearly toward the lower part of the buret. (B) The solution temperature and room temperature are the same, but they are different from the temperature printed on the label of the buret. (C) The temperature of the solution varies by several degrees among measurements. (D)

Explanation / Answer

Ans B) The buret has a linear volume scale printed on it, but the diameter of the buret tube decreases linearly toward the lower part of the buret.

Since the volume of the solution in buret is dependent on the diameter of the buret , so if it narrows down at the end , the aliquot delivered will be less but the reading will come out to be more.

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