Sheet1NAME:Abigail GaulkeQUIZ SECTION:AQSTUDENT ID:1342216LAB PARTNER:Briana JarrotGrading: 55 pts total (45 pts for this template, 10 pts for notebook pages)Notebook pages: Purpose/Method section complete? Are they organized and legible? Have you plotted your data as instructed?

DATA, CALCULATIONS AND GRAPHSPart I: Reaction of hydrogen peroxide and bleachConcentration of stock solutions2 ptsBleach, NaOCl(aq)6.00%m/m NaOClHydrogen Peroxide, H2O2(aq)3.00% m/m H2O2

MeasurementMass of 0.500 mL Bleach, gDensity of Bleach, g/ml10.5431.08620.5461.0930.5451.0940.5451.09Average Density, g/mL1.09

2 pts

1 pt

Run NumbermL of BleachGrams of Hydrogen Peroxide mL of Oxygen GeneratedRun 14.0ml1.01922.0Run 24.0ml1.54030.0Run 34.0ml2.10547.0Run 44.0ml2.64059.0Run 54.0ml3.04460.0Run 64.0ml3.54258.0Run 74.0ml4.11959.0Run 84.0ml4.52961.0Run 94.0ml2.3054.00Run 104.0ml1.8243.00Run 114.0ml1.3329.00

4 pts

Grams of H2O2 solution at the Eqv Point2.65g1 pt

Moles H2O2 at the Eqv Point7.79E-02molesMoles NaOCl at the Eqv Point5.85E-02moles

Stoichiometry: moles H2O2/moles NaOCl4 to 31 pts

3 pts

4 pt

Part II: Iron(II) -Phenanthroline ReactionConcentration of stock 1,10 phenanthroline solution3.6X10^-3M1 ptConcentration of stock Fe2+ solution2.50E-03M1 pt

Volume of stock 1,10 phenanthroline solution you obtained1.00mL

Total Volume of Fe2+ added, mLAbsorbance001000.0512000.1043000.1594000.2145000.226000.227000.228000.225 pts

mL of Fe(II) at the Equivalence Point415mL1 pt

Moles phen at the Eqv Point1.80 X 10^-4molesMoles Fe2+ at the Eqv Point1.04X 10^-6moles

Stoichiometry: moles phen/moles Fe2+152 to 31 pt

3 pts

3 pts1 pt

Chem 142 Experiment #2: Stoichiometry II. Reaction of Hydrogen Peroxide and BleachII. Reaction of Fe2+ with 1,10-Phenanthroline

Results and DiscussionPart I1. The expected stoichiometry is 1:1. How does your result compare (calculate the % error between your mole ratio and the expected value)? Are you within 5% of this value? (2 pts) (1-1.3)/1.0 = -.3 .3 X 100= 30% No, we are not within a 5% of this value as we got a a percent error of 30%.

2. What is your biggest source of error in this part of the experiment? (2 pts)

The biggest source of error in this eperiment is probably human error, for example the rubber tubing could not have been hooked up right, or perhaps we did not wait for the reaction to be completed. This could have cause us to incorrectly measure the amount of Oxygen relaeased.

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3. On the basis of the stoichiometry above, predict the other two products (O2 was one of the products) and write a balanced equation for the reaction between H2O2 and NaOCl. (2 pts)1H2O2 +1 NaOCl 1O2 + 1NaCl + 1H2O

Part II

1. The expected stoichiometry is 3 phen:1 Fe2+. How does your result compare (calculate the % error between your mole ratio and the expected)? Are you within 5% of this value? (2 pts)

(50.66-3)/3 = 15.8915.89 X 100 = 1589% No i am not within 5% of the value.

2. What is your biggest source of error in this part of the experiment? (2 pts)The biggest source of error may have been not waiting all 5 minutes between each addition.

Put your Plot of Volume (mL) of O2 vs Mass (g) of H2O2 here. Make your graph big enough to cover this instruction box so that it is an appropriate size for someone else to read it.

Use the online resources if you need help figuring out how to plot a graph in Excel. (See the links on the postlab page for this report.)

Title the graph and label the X and Y axis, including the correct units. Be sure to double check your units and formatting once you print the report.

Using the line tool on the drawing toolbar, draw the three straight lines: 1) best fit for the data where H2O2 is limiting, 2) best fit for the data where H2O2 is in excess, and 3) a vertical line from the intersection of lines 1 and 2 down to the x-axis in order to clearly identify the equivalence/stoichometric point.

Indicate on your graph where the H2O2 is the limiting reagent and where it is in excess.Type your calculation for the moles of H2O2 at the equivalence point.

2.65g/34.016g=.0779

Type your calculation for the moles NaOCl at the equivalence point.

4.0ml X 1.0895 X 1/74.44gNaOCl= .0585

Put your Absorbance vs mL Fe2+ here. Make your graph big enough to cover this instruction box so that it is an appropriate size for someone else to read it.

Use the online resources if you need help figuring out how to plot a graph in Excel. (See the links on the postlab page for this report.)

Title the graph and label the X and Y axis, including the correct units (Absorbance data is unitless). Be sure to double check your units and formatting once you print the report.

Using the line tool on the drawing toolbar, draw the three straight lines: 1) best fit for the data where Fe 2+ is limiting, 2) best fit for the data where Fe 2+ is in excess, and 3) a vertical line from the intersection of lines 1 and 2 down to the x-axis in order to clearly identify the equivalence/stoichometric point.

Indicate on your graph where the iron is the limiting reagent and where it is in excess.

Type your calculation for the moles Fe2+ at the equivalence point.

.0025mol/l X .415 X 1L/100ml = 3.625 X 10^-6

Type your calculation for the ratio of moles of phen to moles of Fe2+.

(1.80 X 10^-4)/ (3.625 X 10^-6)= 50.66

50.66 X 3=Type your calculation of the moles of 1,10 phenanthroline that you transferred to the 50 mL volumetric flask.

.050L X 3.6 X 10^-3 mol/L= 1.80 X 10^-4By signing below, you certify that you have not falsified data, that you have not plagiarized any part of this lab report, and that all calculations and responses other than the reporting of raw data are your own independent work. Failure to sign this declaration will result in 5 points being deducted from your report score.

Signature: Laboratory Waste Evaluation (1 pt)Laboratory waste is considered anything generated during an experiment that is disposed of down the sewer drain, thrown in the garbage, collected in a container for disposal by the UW Environmental Health & Safety department, or released into the environment. Based on the written lab procedure and your actions during the lab, list the identity and approximate amount (mass or volume) of waste that you generated while performing this experiment.

30g of hydrogen peroxide44 ml of bleach10 wipesremovable tip1ml phenplastic pipets800 microliters of Fe2+Note:ALL sections of this report MUST be typed. With this and all future Excel-based reports, make sure that the report prints correctly (graphs, tables, and text boxes are not split across page breaks) before you turn it in. If you print it and it doesn't look okay, use the tools in Excel to adjust the page breaks and then re-print the report before submitting it.Type your calculation of the density of bleach using the mass data from measurement #1.

.543g/.500ml=1.086g/ml

Type your calculation of the average density of bleach using the mass data from all four measurements..543g/.500=1.086g/ml1.086+1.092+1.090+1.090=4.358.546/.500=1.092g/ml4.38/4=1.0895g/ml.545/.500=1.09g/ml.545/.500=1.09g/ml

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