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Project 13 Finding Concentration And Transmittance

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Project 13: Finding Concentrations and Transmittance
Through Exploring Various Sodas

By

Kathleen Browne (browne8@clemson.edu)
Emma Brandberg (ebrandb@clemson.edu)
Dajonia Jackson (dajonij@clemson.edu )
Junkai Yang (junkaiy@clemson.edu )

Chemistry 101, Section 314
Group 2
Instructor: Mahsa Foroughian
October 3rd

Goals
Understand how to properly read transmittance and absorbance levels using a Spec 20/Spec 200. Then,use food coloring to make solutions of different colors to distinguish the relationship between color, absorption, and wavelength. Analysis how the potassium permanganate reflect on the absorption of light, and its relationship to its percent transmittance and wavelength. Investigate how each beverage react with phosphoric acid. Next, Use ammonium vanadomolybdate (AVM) solution as a reagent to produce the color that represents the wavelength of phosphoric acid. Take the KH2PO4 to make a calibration curve that represents a range typical of the concentration of phosphoric acid in colas. Concentration and absorbance represents a linear relationship. Using this, a calibration curve can be created to determine the concentration of unknown solutions. …show more content…
Starting with 0.101M of phosphate, one should then add 100 mL of water to make 0.00101M. After add another 100 mL of water to obtain 2x10-4. In order to make the blank solution of the spectrometer, add 5 mL of ammonium vanadomolybdate (AVM) to 10 mL of water ( H2O). In a test tube first add 2 mL of water, then 1 mL of AVM. Once solution is mixed, place the solution into a cuvette. Analytically use M1V2=M1V2. M1 being the diluted phosphate solution (.101M), V1 as the different amounts of AVM, V2 as 10 mL of phosphate. Find the concentration M2. Take 5 mL of phosphate with 25 mL of water and dilute the solution into four different concentrations. Test each concentration in the spectrometer to find the absorbance in

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