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JamesonB_Exp 4 - I Limiting and Excess Reactants Exp 4 Date...

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I. Limiting and Excess Reactants Exp. 4 Date Performed: 2/10/11 Name: Breanna Jameson Date Submitted: 2/16/11 Chemistry 1045L-35 Tong Chen II. Purpose The lab tests our abilities to calculate product and reactant amounts using reaction stoichiometry. In this lab we are working with a non-one to one reaction involving Copper (II) Nitrate and Potassium Iodide. The lab also includes the concept of limiting and excess reagents. In this lab we learn how to use the centrifuge and the dessicator.
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III. Procedure Dillon, Stephanie. “Limiting and Excess Reactants.” CHM1045L Online Manual . Fall 2006. 10 February 2011. < http://www.chem.fsu,edu/chemlab/chm1045lmanual/density/index.html >. IV. Data My Data Table for Test Tubes 1 and 2 Test tubes Observations empty masses masses after Exp mass of precipitate 1 brown/orange. "Sand" at bottom 7.6534 g 7.7494g 0.0960 g 2 brown/orange. "Sand" at bottom 7.6777 g 7.7848 g 0.1071 g My Data Table for Test Tubes 1a,1b,2a,2b Test tubes Observations Test Cu(NO 3 ) 2 Test KI 1a brown/clear. No "sand" negative
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1b brown/orange. "Sand" at bottom positive 2a brown/clear. No "sand" negative 2b brown/orange. "Sand" at bottom positive Class Data Table Group Cu (NO 3 ) 2 mL KI mL Masses of ppt tubes 1&2 Test Cu (NO 3 ) 2 Test KI A 1 6 0.1103 & 0.0901 positive negativ e B 2 5 0.2085 & 0.1518 positive negativ e C 3 4 0.1848 & 0.1630 positive negativ e D 4 3 0.1046 & 0.1456 negative positive E 5 2 0.1104 & 0.1035 negative positive F 6 1 0.3798 & 0.2022 negative positive 2Cu(NO 3 ) 2 + 4KI -> 2CuI + I 2 +4KNO 3 Group Moles Cu(NO 3 ) 2 Moles KI
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