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Chem Lab 6

# Chem Lab 6 - 1 Date Preformed Date Submitted Instructor...

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1 Date Preformed: 10/15/2009 Name: Westin Keeler Date Submitted: 10/21/2009 Partner: Becca Maine Instructor: Jinmei Zhang Determination of a Chemical Formula Objective: To determine the stoichiometry of the reaction between sodium hypochlorite (NaClO) and Potassium iodide (KI) in aqueous solution. Experimental Data: Volume Bleach: 131mL Mass KI: 16.6g V NaClO (mL) V KI (mL)Initial T(°C) NaClO Initial T(°C) KI Final T(°C) 45.0 05.0 21.60 22.18 21.76 40.0 10.0 21.60 22.18 28.78 35.0 15.0 21.60 22.18 28.58 30.0 20.0 21.60 22.18 27.07 25.0 25.0 21.60 22.18 26.54 20.0 30.0 21.60 22.18 25.43 15.0 35.0 21.60 22.18 24.70 10.0 40.0 21.60 22.18 23.90 05.0 45.0 21.60 22.18 22.62 Sample Calculations : Mole Fraction NaClO: Volume NaClO = 45.0 mL = 0.90 Volume NaClO + Volume KI 45.0 mL + 05.0 ml Average Initial T: (T1V1) + (T2V2) = (21.60)(45.0) + (22.18)(5.00) = 21.7°C (V1+V2) (45.0 + 05.0) Change in T: T final - T avg = 21.76 - 21.7 = 0.1°C From the graph, the mole fraction NaClO with the largest ΔT is 0.80, the corresponding mole fraction KI is: Volume KI = 10.0 mL = 0.20 Volume NaClO + Volume KI 40.0 mL + 10.0 ml Then a/b is 0.80, or 4/5

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2 V NaClO (mL) V KI (mL) Initial T(°C) NaClO Initial T(°C) KI Final T(°C) Mole Fractio n NaClO Δ T(°C) Avg Initial T(°C) 45.0 5.0 21.60 22.18 21.76 0.9 0.1 21.7 40.0 10.0 21.60 22.18 28.78 0.8 7.1 21.7 35.0 15.0 21.60 22.18 28.58 0.7
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Chem Lab 6 - 1 Date Preformed Date Submitted Instructor...

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