Identification of an Unknown Acid

Identification of an Unknown Acid - Identification of an...

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Unformatted text preview: Identification of an Unknown Acid April 2 nd , 2008 Lab Section 2216 Chemistry 002 Yunyun Wu Rebecca Dermody & Courtney McKenna I. Purpose: The purpose of this lab was to identify an unknown acid by calculating its molar mass, density, melting point, and pH titration. The identity of the unknown was found by comparing the found values to known values of acids. II. Procedure: Fill buret with NaOH Dissolve 0.112 g unknown solid in water Titrate unknown and record pH at every mL Find apparent molar mass Measure physical date o Melt solid unknown acid to determine melting point o Weigh unknown to determine density Find known acids with similar melting points, molar mass, and density Combine unknown acid and known acid and find new melting point III. Observations and Results: Values of Unknown Acid Melting Point 138C Density 1.29 g/mL Molar Mass 132. 64 g/mol pH Titration: NaOH (mL) pH 1 5.14 2.0 5.20 3.0 5.23 4.0 5.25 5.0 5.35 6.0 5.48 7.0 5.60 8.0 5.70 9.0 5.87 10.0 6.05 11.0 6.23 12.0 6.40 13.013....
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Identification of an Unknown Acid - Identification of an...

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