HShin_Hoon_Shin_-_Lab_1_Report

HShin_Hoon_Shin_-_Lab_1_Report - Author: Hoon Shin TA:...

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Author: Hoon Shin TA: Eileen Chen Section: A05 Class: Chem100A, UCSD(University of California San Diego) Buret Preparation and Calibration Abstract First part of this experiment involves the self training of usage of buret properly by observing drops/mL of water. In this experiment, using buret # 83, volume of one drop from the buret was determined by series of ten tests which was 20.5±1.25. However, by using the class data, the average drops/mL was turn out to be 81.73±205.81. For the second part of experiment was done five times. The result of average correction was 0.03mL. Overall lab results seem to be satisfactory. Introduction The main objective for this lab experiment is for one to get familiar with the lab equipment, such as buret, as well as for one to learn the correct usage of significant figures to get a “high precision” results . In a real life, in chemical laboratories y , one will always encounter the situation where he or she has to pick experiment method. The experiment method can be quick but imprecise, or slow but highly precise. Thus, it is important to learn this lab experiment for one to be able to know when to perform which method in certain situation. In part 1 of the lab experiment, one will learn basic techniques of using a buret correctly and reading a buret accurately. One must perform more than one trial because no matter how one believes as “high precision” the results are, random error is unavoidable. Thus one should give numerical set of trial and try the Q-test to see if the results are precise or not.
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In part 2 of the lab experiment, one was expected to perform calibration of the Buret. One can compare the value obtained by mass of the water and density to the volume reading by buret and will be able explain how temperature affects density. After all these experiments, one should be ready to work furthermore experiments which require using the buret. Experimental Part I – Ratio (mL/drop and drops/mL) In 500mL clean and labeled beaker, obtained 400mL of deionizer water and covered watch glass on the top. The beaker was left on the bench for about ten minutes for it to equilibrate with the surrounding temperature. Picked a buret from the rack and recorded the number of buret (buret #83). When reading the buret, level of the meniscus was recorded. Significant figure that are required using this buret was two actual value and one estimated value (Ex: 2.03). Deionized water was filled into the leak-free buret up to where meniscus in the buret was below the 0.00mL mark and touched the tip of the buret to remove the suspended water. Recorded the reading on the buret and drain exactly 40drops out of the buret and waited for 30 seconds before recording to remove and clinging water from the buret. The procedures were repeated nine more times to get total of ten results. The equation used to calculate the total volumes delivered was following:
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HShin_Hoon_Shin_-_Lab_1_Report - Author: Hoon Shin TA:...

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