and NAME ID Number: Quiz Section:
LAB PARTNER:
EXPERIMENT 3: STOICHIOMETRY I. REACTION OF HYDROGEN PEROXIDE AND BLEACH II. REACTION OF IRON (II) WITH 1,10 PHENANTHROLINE
Grading: 35 pts for this template
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Purpose and Method
Part I (3 pts)
Part II (3 pts)
DATA, CALCULATIONS AND GRAPHS
Part I: Reaction of hydrogen peroxide and bleach Concentration of stock solutions
Bleach, NaOCl(aq) Hydrogen Peroxide, H2O2(aq) 5.25 3.00 %m/m NaOCl % m/m H2O2
Mass of 0.500 mL Bleach, g 0.536 0.546 0.547 0.537 Average Density, g/mL
Density of Bleach, g/ml 1.072 1.092 1.094 1.074 1.083 2 pts mL of Oxygen Generated 31 38 55 60 67 68 68 68
Run Number Run 1 Run 2 Run 3 Run 4 Run 5 Run 6 Run 7 Run 8 Run 9 Run 10
mL of Bleach 4.0 mL 4.0 mL 4.0 mL 4.0 mL 4.0 mL 4.0 mL 4.0 mL 4.0 mL 4.0 mL 4.0 mL
Grams of Hydrogen Peroxide 1.140 1.625 2.150 2.585 3.165 3.631 4.105 4.552
1 pt
Put your Plot of Volume of O2 (mL) vs Mass of H2O2 here. Starting at one end of Your Y values, drag mouse to the other end. This will 'select' your Y values Insert Chart, Under Standard types, select XY scatter and under chart sub- types, select the option unconnected data points (usually at the top). Next , select Series and under Series, go to X values box. Now drag your mouse from end of the X values to the other. The X values must match the Y values. Next: Now Title the graph and label the X and Y axis, remember the units Finish. Modfify size and or move graph to this location. Using the line tool bar (bottom left hand side), draw the two straight lines and read the intersection as best as you can.
Volume of Oxygen gas produced from 4 ml of Bleach
2 pts
80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 Mass of Hydrogen Peroxide (g) Volume of Oxygen (ml)
Series1
Grams of H2O2 at the Eqv Point
3 g
2 pts
Moles H2O2 at the Eqv Point Moles NaOCl at the Eqv Point Stoichiometry Moles H2O2/Moles NaOCl
2.65E-03 moles 2.93E-03 moles
2 pts 2 pts
0.902/1
1 pt
Moles H2O2 at the Equivalence Point Calculation. Calculation may be hand written
1 pt 1 pt
Moles NaOCl at the Equivalence Point Calculation. Calculations may be hand written.
1 pt
Part II: Iron(II) -Phenanthroline Reaction
phen stock solution concentration Fe(II) stock solution concentration Volume of 1,10 phenanthroline phen moles 7.20E-05 0.0025 1.00 3.60E-06 M M mL moles
Volume of Fe(II) added, mL 0 100 200 300 400 500 600 700 800
Absorbance 0.00 0.05 0.11 0.20 0.27 0.30 0.30 0.29 0.29
1 pt
Put your Absorbance vs mL Fe(II) here. Starting at one end of Your Y values, drag mouse to the other end. This will 'select' your Y values Insert Chart, Under Standard types, select XY scatter and under chart sub- types, select the option unconnected data points (usually at the top). Next , select Series and under Series, go to X values box. Now drag your mouse from end of the X values to the other. The X xalues must match the Y values. Next: Now Title the graph and label the X and Y axis, remember the units Finish. Modfify size and or move graph to this location. Using the line tool bar (bottom left hand side), draw the two straight lines and read the intersection as best as you can.
Absorbance - mL of Fe(II) Plot
0.35
2 pts
0.30 mL of Fe(II) 0.25 0.20 0.15 0.10 0.05 0.00
0 200 400 600 Absorbance 800 1000
Series1
mL of Fe(II) at the Equivalence Point
0.48 mL
2 pts
Moles Fe(II) at the Eqv Point Moles phen at the Eqv Point Stoichiometry Moles phen/Moles Fe(II)
1.20E-06 moles 3.60E-06 moles
2 pts 2 pts
3
1 pt
Moles phen at the Equivalence Point Calculation. Calculation may be hand written
Moles phen at the Equivalence Point Calculation. Calculation may be hand written
1 pt
Moles Fe(II) at the Equivalence Point Calculation. Calculations may be hand written.
1 pt
Results and Discussion
Part I: 1. The expected stoichiometry is 1:1. How does your result compare? Are you within 5% of this values? (1 pt)
2. What is the biggest source of error in this experiment? (2 pts)
3. On the basis of the stoichiometry above, predict the other products (O2 was one of the products) and write a balanced equation for the reaction between H2O2 and NaOCl. (2 pts)
Part II 1. The expected stoichiometry is 3 phen:1 Fe(II). How does your result compare? Are you within 5% of this values? (1 pt)
2. What is the biggest source of error in this experiment? (1 pt)
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