Additivity of Pure Substances.docx

Additivity of Pure Substances.docx - Additivity of Pure...

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Additivity of Pure Substances Nathan Lim CHM 121-005
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Introduction : There were two parts to the experiment, the first one consisted of testing the accuracy and precision of various volumetric glassware found in a chemistry laboratory. Considering the large amount of complicated and complex glassware available to a chemist (flasks, graduated cylinders, biurets, pipets), how does one know which one to use and in which scenarios do you use them for? A beaker being used to measure out miniscule values in which the slightest error can be the difference between a successful experiment and an unsuccessful one wouldn’t be too wise. Which one is able to provide the most accurate information and reliably reproduce the same values? Accuracy speaks to the closeness of a measurement to the standard or true value. Precision is the reproducibility of those data points and how close they come in relation to each other. Reliability, however, is taken into account when examining the pieces of equipment that the experimenter uses. Does it allow for human error, such as the experimenter not knowing how to use the equipment properly? The second one involved the use of the most accurate and precise pieces of glassware and utilizing them to answer the question of, “Are the Volumes of Pure Substances Additive?”. That is talking about an idea where if we take the two volumes of pure substances and add them together, would they add up to the sums of their values? For example, 5 mL of distilled water plus 5 mL of isopropyl alcohol, by that question, should/shouldn’t equal 10 mL.
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Procedure : Part I: 1. Divided the 4-man group up with each person assigned their own volumetric glassware (25 mL Erlenmeyer flask, 10 mL graduated cylinder, 25 mL biuret, and a volumetric pipet. 2. Each person had picked a certain volume of water between 10 and 25 mL, each of the volumes being different from person to person. 3. Collected 200 mL of deionized water to be used amongst the 4 group members.
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  • Fall '15
  • Dr. Monica Edwards
  • Sociology, Accuracy and precision, Pipette, 0.87 g, 4.36 g

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