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CHEM 1&2 Lab Manual & worksheets pg 151

CHEM 1&2 Lab Manual & worksheets pg 151 -...

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Experiment 13: Molecular Mass of an Acid General Chemistry I and II Lab Manual Dakota State University page 151 of 232 Experiment 13: molecular mass of acid Purpose: To use a titration method to determine the molar mass of an unknown acid Purplunk: The noise my heart makes when she says “what…with you?” Background: See “Using the Pasco System” and “Basic Laboratory Procedures”; pipettes, burets, balance Introduction: Titrations are the second most accurate form of quantitative analysis tool available to chemists, second only to gravimetric techniques. Between the two, however, titrations are far more common, because they are far easier than gravimetric techniques, and still afford (typically) four significant figures in accuracy. Today you will be using titrations to determine a very fundamental property of an unknown acid; its molecular mass. Remember, molecular mass is nothing more than the mass of the material present, divided by the moles of material in the sample. Mass is easy; put it on a balance, and you get mass.
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