Stoichiometry_Report

Stoichiometry_Report - Stoichiometry 10/11/07 Chemistry...

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Stoichiometry 10/11/07 Chemistry 001, Section 2119 Course # 1391 TA: Yanyan Huang Laura Jordan Alexandria Hernandez Amanda Quella
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Purpose: This experiment uses Job’s method and the Mole-Ratio method to predict the products of a reaction by finding the mole ratio of OH ¯ /Ni ² . The ratio is found by using the concept of limiting reactants. Procedure: Calibrating Pipets: Beral pipets were assigned to each of the four solutions needed. Each pipet was calibrated by filling with water and then dropping 1.00 mL into a 10 mL graduated cylinder. The drops needed to reach 1 mL were counted and recorded for each of the four pipets. Each pipet was calibrated three times. 1. Job’s Method: Using the pipet, nine wells (A1-B3) were filled in a 24- well plate according to table 4 in the lab manual. The solution was mixed by swirling, and left to settle for 3 minutes. Five drops were then transferred from each well into corresponding wells (C1-D3). The pipet was rinsed with deionized water between each transfer. To test for excess hydroxide, 1 drop of Alizarin Yellow R solution was added to wells A1-B3. To test for excess nickel ion, 1 drop of DMG was added to wells C1-D3. The plate was then covered and swirled to mix. The color changes of the wells were then recorded. The plate was then rinsed out with deionized water and dried. 2. Job’s Method #1 was repeated using 0.20 M Ni(NO ) and 0.10 M NaOH. 3. Mole-Ratio Method: The same steps were followed as in Job’s Method #1, but table 5 from the lab manual was used, which meant the # of drops of 0.20 NaOH were kept constant at 3, drops of 0.10 M Ni(NO ) were increased from 1, and the # of drops of water were decreased from 9. 4. The same steps were followed as in Job’s Method #1, with the exception that table 6 from the lab manual was used, which meant the # of drops of 0.20 M NaOH were kept constant at 3, while # drops of 0.10 M Ni(NO ) were increased from 1, and # drops of water decreased from 9. Data/Results:
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Column1 Trial #1 (drops per mL) Trial #2 Trial #3 Average # drops/ mL Volume 1 drop (mL) Reagent used with pipet Pipet #1 23 21 23 22.3 0.0448 0.10 M Ni(NO ) (Det. 1) ₃ ₂ Pipet #2 23 22 21 22 0.0455 0.10 M NaOH (Det. 1) Pipet #3 19 18 18 18.3 0.0546 0.10 M Ni(NO ) (Det. 3) ₃ ₂ Pipet #4 19 19 19 19 0.0526 0.20 M NaOH (Det. 3) Well # A1 A2 A3 A4 A5 A6 B1 B2 B3 # drops of 0.1 M Ni(NO ) ₃ ₂ 1 2 3 4 5 6 7 8 9 # drops of 0.1 M NaOH 9 8 7 6 5 4 3 2 1 Moles Ni(N0 ) ₃ ₂ 4.48E-06 8.96E-06 1.34E-05
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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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Stoichiometry_Report - Stoichiometry 10/11/07 Chemistry...

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