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stoichiometry lab

# stoichiometry lab - 35 mL NaClO& 15 mL KI Definitions 1...

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Date Performed: 10/22/04 Name: Ronald Lampkins Date Submitted: 10/29/04 Partner: Jenny Charlton Instructor: Mr. Lee Stoichiometry: Method of Continuous Variations Objective: To determine the stoichiometry of the reaction between sodium hypochlorite (NaClO) and potassium iodide (KI) in aqueous solution. Experimental Data: Exp. # Vol. of NaClO (mL) Vol of KI (mL) Initial Temperature of NaClO & KI ( C) Final Temperature ( C) Temperature ( C) 1 45 5 21.78 25.09 3.31 2 40 10 21.78 28.20 6.42 3 35 15 21.78 29.94 8.16 4 30 20 21.78 28.87 7.09 5 25 25 21.78 27.80 6.02 6 20 30 21.78 26.90 5.12 7 15 35 21.78 25.92 4.14 8 10 40 21.78 24.57 2.79 9 5 45 21.78 23.53 1.75 Sample Calculation: Mole fraction of NaClO = Volume NaClO (Volume NaClO + Volume KI) 45 mL NaClO / (45 mL NaClO + 5 mL KI) = 0.9 mol Experiment # Temperature ( C) Mole Fraction 1 3.31 0.9 2 6.42 0.8 3 8.16 0.7 4 7.09 0.6 5 6.02 0.5 6 5.12 0.4 7 4.14 0.3 8 2.79 0.2 9 1.75 0.1

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Calculation of mole fraction: 0.7 = [a/(a+b)] (a+b) = 50 mL 0.7 x 50 mL = 35 mL a or 35 mL NaClO 50mL – 35 mL = 15 mL b or 15 mL KI Mole fraction resulting in maximum heat release:
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Unformatted text preview: 35 mL NaClO & 15 mL KI Definitions: 1. Stoichiometric coefficient-A number that is multiplied to all of the atoms in the formula that follows it. 2. Mole fraction- The number of moles of a component divided by the number of moles in the mixture. 3. Molarity- The measure of a solutions concentration in moles per liter of the solution. Uncertainties: Measuring the different volumes of the NaClO and KI solutions from the graduated cylinder may have led to some of the uncertainty associated with this lab. If the measurements were not exact, then the temperature change would be altered and thus give slightly different results. Conclusions: According to the data collected in our lab experiment, it appears that a 35 mL solution of NaClO and a 15 mL solution of KI will release about 8.16 C. This was the highest amount of heat released when varying the volumes of the two reactant solutions....
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stoichiometry lab - 35 mL NaClO& 15 mL KI Definitions 1...

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