102206Determination of the Percent Acid in an Unknown Lab

102206Determination of the Percent Acid in an Unknown Lab -...

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10 The Determination of the Percent Acid in an Unknown CH 141 Laura Dunn 10/24/06 Section 101
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Purpose : To determine the concentration of a known solution and from that determine the percent acid in an acid of unknown concentration by using titration. Procedure : Refer to lab text. Pre-Lab: 2. a. H 2 C 2 O 4 x 2H 2 O + 2NaOH Na 2 C 2 O 4 + 4H 2 O b. H 2 SO 4 + 2NaOH Na 2 SO 4 + 2H 2 O c. HC 2 H 3 O 2 + NaOH NaC 2 H 3 O 2 + H 2 O 3.
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Data : Weight of oxalic acid 3.2812 g First Titration 1 2 Final 41.1 42.4 Initial 0.0 0.1 Vol. of NaOH (in mL) 41.1 42.3 Titration of Unknown (#2) 1 2 Final 15.6 15.6 Initial 0.0 0.0 Vol. of NaOH (in mL) 15.6 ml 15.6 ml Volume of NaOH (in mL) pH 0 mL 2.16 1 2.23 2 3.28 3 3.48 4 3.66 5 3.83 6 3.96 7 4.07 8 4.20 9 4.32 10 4.44 11 4.57 12 4.73 13 4.90 14 5.13 15 5.55 15.1 5.64 15.2 5.70 15.3 5.79 15.4 5.89 15.5 6.10 15.6 6.32
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Unformatted text preview: 15.7 6.39 15.8 9.59 pink color 16 10.23 17 11.13 18 11.41 19 11.56 20 11.65 21 11.73 22 11.80 Calculations : Results: My results for the first part of the experiment were a little off because the second titration reading was more than the first when it should have been less. However, the unknown titration was exact and was very close to my reading when we used the pH reader. The percent acid of the unknown was 0.935%. The goal of this experiment to determine the concentration of a known solution and from that determine the percent acid in an acid of unknown concentration by using titration was acheived....
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This note was uploaded on 04/17/2008 for the course CH 141 taught by Professor Newman during the Spring '08 term at Union.

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102206Determination of the Percent Acid in an Unknown Lab -...

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