Determination of an unknown acid by PK

Determination of an unknown acid by PK - Determination of...

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Unformatted text preview: Determination of an Unknown Acid by its pKa April 1, 2008 Lab Section 2107 Course Number 4103 Simon Duri Amanda Quella Laura Boucher 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 5 10 15 20 25 30 35 40 45 50 pH Volume (mL) pH Titration of Unknown Acid Purpose: To determine an unknown acid by its PK. Procedure : 1. Three different masses of the unknown: 0.105 g, 0.100 g, 0.100 g, and 0.104 g were titrated with standardized NaOH solution. 2. 0.097 grams of unknown were titrated with standardized NaOH solution with the pH measured after the addition of about 1.0-1.5 mL of NaOH. 3. The density of the unknown was determined by weighing a 1.00 mL volumetric flask with the stopper, a small portion of the unknown which was transferred to the flask, then filled with hexane, and the total mass was measured. 4. The melting point of the unknown was determined through the use of a capillary tube and a melting point mechanism. 5. The melting point of the unknown was also determined through mixing the unknown with some possible acids. The two substances were ground together and then the melting point was again determined. Data: pH V NAOH (L) miliMoles NaOH miliMoles A- miliMoles HA x 2.01 0.0000 0.00000 0.00000 1.2610 Nonreal Answer 2.03 0.0010 0.09580 0.09580 1.16501....
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This note was uploaded on 04/18/2008 for the course CHEM 102 taught by Professor Haworth during the Spring '08 term at Marquette.

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Determination of an unknown acid by PK - Determination of...

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