Question

1. Record the following lab data in the table below. If you had to repeat one of the titrations, disregard the value that was different.

   (a) volume of potassium dichromate solution added to the Erlenmeyer flask in mL	5.00mL
   (b) coarse titration volume of iron (II) solution range in mL	39ml-35mL left with 11-14.90mL admin
   (c) volume of iron (II) solution delivered from the burette in mL during the first fine titration	14.14mL
   (d) volume of iron (II) solution delivered from the burette in mL during the second fine titration	14.13mL
   (e) average volume of iron (II) solution used in the fine titrations	14.135mL
   (f) the color of the analyte solution at the end point of the titration	bright green
   (g) the color of the analyte solution after adding the indicator	deep purple

Data Analysis

2. Record and calculate the quantities in the table below using the data from your dichromate titrations. Use an average value for the volume of iron (II) solution used in the titration. If one of your values is very different, and you had to perform the titration three times, disregard the value that was very different when computing the average.

   (a) volume of potassium dichromate solution added to the Erlenmeyer flask in mL	5.00mL
   (b) moles of dichromate ion added to the Erlenmeyer flask	0.1359x5=0.6795milimoles
   (c) average volume of iron (II) solution delivered from the burette in mL	14.135mL
   (d) moles of iron (II) ions delivered from the burette
   (e) moles of excess dichromate ions that reacted with the iron (II) ions (remember that the ratio in which they react is 1 dichromate : 6 iron (II))
   (f) moles of dichromate that reacted with the ethanol in the vodka (Subtract excess dichromate ions that reacted with the iron (II) ions from the original moles of dichromate ion present.)
   (g) moles of ethanol in the 5 mL diluted vodka sample according to the stoichiometric ratio of 2 dichromate ions to 3 ethanol molecules

     
3. The amount of alcohol in a drink is typically reported as percent alcohol by volume. Volume percent or volume/volume percent (% v/v) most often is used when preparing solutions of liquids. Volume percent is defined as:
   % v/v = V_solute/V_solution × 100
   Find the percent alcohol (ethanol) by volume for the vodka used in the lab by following the steps outlined in the table below.

   (a) given the molar mass of ethanol of 46.07 g/mol, calculate the mass of alcohol (ethanol) in the tested sample solution
   (b) given the density of ethanol of 0.7893g/ml, find the volume in mL of ethanol present in the diluted vodka solution
   (c) record the volume of vodka used in the experiment in mL
   (d) find the percent alcohol by volume (% v/v) in the diluted vodka solution
   (e) the diluted vodka solution was prepared by diluting 2.00 mL vodka to 100.00 mL. Calculate the dilution factor used (N:1)
   (f) multiply the percent alcohol by volume in the diluted vodka solution by the dilution factor to obtain the % v/v alcohol in the original vodka solution

Conclusions

1. The Grey Moose vodka tested in this lab reports a percent alcohol by volume of 40.0% on its label. How does your value compare to the reported one? If the values are different, give one possible experimental error that might have contributed to the difference.  
2. Potassium permanganate is another strong oxidizing substance similar to potassium dichromate. An acidic solution of purple permanganate ions can get reduced to colorless Mn² ions in the presence of ethanol. Write down the redox reaction between permanganate and ethanol, and balance it using the half-reaction method.
3. Besides vodka, there are other colorless alcohol-containing beverages that can be titrated following the procedure in your lab. Given the average values for the percent alcohol by volume listed in the table below, which beverage do you expect to use the least amount of iron (II) standard solution during the titration? Assume all lab procedures stay the same.

   	% alcohol by volume
   White rum	37.0%
   Vermouth	18.0%
   White whine	12.0%

   NOTES: exp flask 1: Potassium Dichromate 4g = 1.5mL red solute +30ml H2O to dissolve =orange solutions 31.5mL filled to 100mL mark flask2 Iron (III) Ammonium Sulfate Hexahydrate 4g (green solute) 2.2mL+30mL H2O=32.8mL solution sea foam green color-filled to 100ml mark flask3 Iron (III) Ammonium Sulfate Hexahydrate 4g (green solute) 2.2mL+30mL H2O=32.8mL solution sea foam green color-filled to 100mL mark flask 4: 2ml Grey moose vodka filled to 100mL mark=1/50th or 2% of original concentration exp 2 PART ONE EF: 5mL 2% GMV + 35mL H2O =40mL 1/8th concentration or 0.25% original concentration +5mL 6M Sulfuric Acid = 45mL +5mL standard Potassium Dichromate Solution now solution is apple green 50mL PART TWO standard Iron (ii) solution V=50.00ML D=0.00mL added to the EF of part 1 sodium diphenylamine sulfonate +0.50g =50.3mL deep purple color Course Titration V39mL/D11mL V35.10mL/D14.90mL green again Fine titration:50/0 V1: 35.86 V2:35.87 D1:14.14 D2:14.13 flask: 64.42 flask:64.43

I've provided the lab and notes from the lab, if someone could help me with the data 2 analysis with work so I can understand how to do the problems, that would be great! Thanks!