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Measurement 6B - Stoichiometry Date Performed Date...

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Stoichiometry Date Performed: 10/16/08 Name: Neal Moriconi Date Submitted: 9/23/08 Partner: Stephen Hunter Instructor: Diaqiang Xu Stoichiometry Objective: The purpose of this experiment is to determine the stoichiometry of the reaction between sodium hypochlorite (NaClO) and potassium iodide (KI) in aqueous solution. Experimental Data: Vol NaClO (ml) Vol KI (ml) Temperature initial NaClO ( C) Temperature initial KI ( C) Temperature final ( C) 45 5 23.71 23.55 26.55 40 10 23.88 24.61 24.03 35 15 24.02 23.32 31.17 30 20 24.01 23.12 29.72 25 25 24.02 23.03 28.81 20 30 24.05 22.89 27.55 15 35 24.11 22.98 26.43 10 40 24.09 23.22 25.38 5 45 24.16 23.44 24.34 Sample Calculation: Mole fraction NaClO = + moles of NaClOmoles of NaClO moles of KI = Volume NaClOVolume + NaClO Volume KI EX) . . + . 45 045 0 5 0 = 0.9 T Initial = + ( )( + ) T1V1 T2V2 V1 V2 EX) ( . * . )+( . * . )( . + . ) 23 710C 45 0ml 23 550C 5 0ml 45 0ml 5 0ml = 27.9618 C ≈27.96 C ΔT = T final - T initial EX) ΔT = 26.55 C –23.69 C = 2.86 C
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Stoichiometry Results and Conclusions: Vol NaClO (ml) Vol KI (ml) Mole fraction of NaClO Initial Temp ( C) Final Temp ( C) Delta T ( C) 45 5 .9 23.69 26.55 2.86 40 10 .8 24.03 24.03 0.00 35 15 .7 23.81
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Stoichiometry 31.17 7.36 30 20 .6 23.65 29.72 6.07 25 25 .5 23.53 28.81 5.29 20 30 .4 23.35 27.55 4.20 15 35 .3 23.32 26.43 3.11 10 40
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