Stoichiometry of NaOCl and KI Reaction, Lab Reports of Chemistry

Download Stoichiometry of NaOCl and KI Reaction and more Lab Reports Chemistry in PDF only on Docsity! Nick Waugh Stoichiometry Objective: To determine the stoiciometry of the reaction between sodium hypochlorite (NaClO) and potassium iodide (KI) in aqueous solution. Experimental data: Sample Calculations: Tinitial= (T1V1)+(T2V2)/(V1+V2) Tinitial for 5 mL NaCLO [(19.88+5)+(19.15+45)]/(50)=19.223⁰C Mole fraction: (volume NaCLO)/(Volume NaClO+ Volume KI) Mole fraction for 5 Ml NaCLO: (5/50)=.1 Maximum ∆T mole fraction Mole fraction= A/(A+B) .8=maximum mole fraction .8=A/(A+B) (A+B)=50 B=(50-A) .8=A/(A+(50-A)) A=40 B=50-40 B=10 ratio of A/B= 40/10 =4:1 VNaCLO (mL) VKi (mL) Ti (NaClO) Ti (Ki) Tf (⁰C) 0 50 ------ --------- -------- 5 45 19.88 19.15 20.01 10 40 19.73 19.10 20.93 15 35 20.15 19.03 21.98 20 30 19.78 19.00 23.18 25 25 19.82 18.93 23.72 30 20 19.98 18.84 24.68 35 15 19.98 18.78 25.69 40 10 20.13 18.61 26.63 45 5 20.21 18.44 23.01 50 0 ------ --------- -------- Results and Conclusions: Discussion and Discrepancy After I finished the experiment I realized that, in general, the initial temperature of the solution got higher as the amount of NaCLO increased and the amount of KI decreased. The highest final temperature and temperature change of the solution occur when the ratio of NaClO to KI is 4:1. One possible reason for discrepancy in the experiment is that we measured the volume of each solution incorrectly, so instead of 20 mL of NaCLO there would be 23 mL. Answers to questions A) Stoichiometric coefficient- The number in front of each substance in a balanced chemical equation. B) Mole fraction- the ratio of the amount of each mole of substance to the total number of moles. C) Molarity- the number of moles of solute dissolved in one liter of solution. VNaCLO (mL) VKi (mL) Mol FractionNaClO Ti (⁰C) Tf (⁰C) ∆T (⁰C) 0 50 0 --------- -------- ---------- 5 45 .1 19.223 20.01 .787 10 40 .2 19.226 20.93 1.704 15 35 .3 19.336 21.98 2.644 20 30 .4 19.312 23.18 3.868 25 25 .5 19.375 23.72 4.345 30 20 .6 19.524 24.68 5.156 35 15 .7 19.62 25.69 6.07 40 10 .8 19.826 26.63 6.768 45 5 .9 20.033 23.01 2.997 50 0 1 --------- -------- ---------