lab3report - Virginia Lieu October 10, 2008 GSI: Paul...

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Virginia Lieu October 10, 2008 GSI: Paul Ganssle Chemistry 1A Molarity of an Acid Purpose In this experiment, the objective was to calculate the molarity of an unknown solution using the known amounts of base and acid, to develop useful analytical skills in calculations of molarity and percent difference, and to improve laboratory technique. Methods All materials were thoroughly rinsed and cleaned with distilled water before and after the experiment. After creating a solution containing 15mL of 5M HCl and distilled water in a 250.00mL volumetric flask and filling the buret with above solution, the TRIS standard was measured to an amount between 0.15g to 0.25g and mixed with 50mL of water in an Erlenmeyer flask. Adding distilled water to the 15mL of 5M HCl created a stock solution of unknown pH. Mixing the sample of TRIS standard with 50mL distilled water is done to dissolve the TRIS standard for titration. The bromocresol green indicator, used to tell the acidity of a solution, was added, turning the solution Page 1
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light blue and placed under the buret. By using bromocresol green indicator, one can tell when the TRIS standard solution is fully titrated. By carefully turning the stopcock, the acid solution was gradually added to the TRIS
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This note was uploaded on 09/21/2009 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at University of California, Berkeley.

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lab3report - Virginia Lieu October 10, 2008 GSI: Paul...

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