LAB #7 Kinetics: Oxidation of Organic Dye Molecules 40.0 mL of DI water is added to...
LAB #7 Kinetics: Oxidation of Organic Dye Molecules
40.0 mL of DI water is added to 10.0 mL of a brilliant blue solution to dilute it. The absorbance at λ = 630 nm of the diluted brilliant blue solution is measured to be 0.452. Using the molar absorptivity coefficient (ε) that you measured in part I of today’s lab, what is the concentration of the undiluted brilliant blue solution? Show your work.
Molar absorptivity coefficient = 138,328 M-1cm-1
path length= 1cm
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LAB #7 Kinetics: Oxidation of Organic Dye Molecules
40.0 mL of DI water is added to...
The last digit in the answer is four X.X4 A 3.75 mL unknown sample containing red...
The last digit in the answer is four X.X4
A 3.75 mL unknown sample containing red and blue dyes was separated on a solid phase extraction column. As it was eluted from the column, each sample was diluted to a total volume of 50.00 mL in a volumetric flask with the appropriate solvent. UV spectrophotometry was used to determine the amount of dye in the diluted sample. The data collected by the students in the lab are provided below. Sample...
PRE-LAB (5): EXPERIMENT #7, Redox and Spectrophotometric Determina 7, Redox and Spectrophotometric Determination of Manganese in...
PRE-LAB (5): EXPERIMENT #7, Redox and Spectrophotometric Determina 7, Redox and Spectrophotometric Determination of Manganese in order to analyze for manganese by photometry, Mn? in the sample is converted to deep purple MnO.. What reagent is used to bring about this oxidation 4420 2. (1) Write and balance the redox reaction for the oxidation of Mn(II) to Mn(VII). How many electrons are involved? 3. (1/2) Sometimes you get a brown precipitate during the oxidation step in this experiment. What is...
Pre-Lab Assignment 1) Draw the reaction mechanism for the reaction. 2) Determine the limiting reagent. Procedure...
Pre-Lab Assignment
1) Draw the reaction mechanism for the reaction.
2) Determine the limiting reagent.
Procedure 1 Place approximately 1 g of stilbene dibromide prepared in last week's experiment in a 50 mL round bottom flask. Record the exact mass. Add 0.8 g of KOH and 4 mL of triethylene glycol from the syringe provided in the fume hood (rinse any crystals from the sides of the flask while adding triethylene glycol). 2 Heat the stirred reaction mixture to a...
The last digit in the answer is four X.X4
A 3.75 mL unknown sample containing red and blue dyes was separated on a solid phase extraction column. As it was eluted from the column, each sample was diluted to a total volume of 50.00 mL in a volumetric flask with the appropriate solvent. UV spectrophotometry was used to determine the amount of dye in the diluted sample. The data collected by the students in the lab are provided below. Sample...
PRE-LAB (5): EXPERIMENT #7, Redox and Spectrophotometric Determina 7, Redox and Spectrophotometric Determination of Manganese in order to analyze for manganese by photometry, Mn? in the sample is converted to deep purple MnO.. What reagent is used to bring about this oxidation 4420 2. (1) Write and balance the redox reaction for the oxidation of Mn(II) to Mn(VII). How many electrons are involved? 3. (1/2) Sometimes you get a brown precipitate during the oxidation step in this experiment. What is...
Pre-Lab Assignment
1) Draw the reaction mechanism for the reaction.
2) Determine the limiting reagent.
Procedure 1 Place approximately 1 g of stilbene dibromide prepared in last week's experiment in a 50 mL round bottom flask. Record the exact mass. Add 0.8 g of KOH and 4 mL of triethylene glycol from the syringe provided in the fume hood (rinse any crystals from the sides of the flask while adding triethylene glycol). 2 Heat the stirred reaction mixture to a...
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