Expt 11 .pdf - Part A Preparing Kool-Aid solutions \u2022 Mass of mix 1 transferred Mass unopened mass emptied = mass of mix 1 transferred 5.4737 1.1575 =

Expt 11 .pdf - Part A Preparing Kool-Aid solutions u2022...

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Part A: Preparing Kool-Aid solutions • Mass of mix 1 transferred: Mass unopened - mass emptied = mass of mix 1 transferred 5.4737 - 1.1575 = 4.3162 • Stock solution concentration: Mass mix transferred x 100 = stock solution concentration 4.3162 x 100 = 4316.20 • First dilution’s concentration: Concentration = Mg solid / L solution 431.620 = 4.3162 / 100 II. Additional Questions 1. Which wavelength choice among those available with the Vernier colorimeter would be the best choice for a Beer’s Law experiment using strawberry Kool- Aid? Assume kool aid "strawberry " color is red --> we must absorb that wavelength red color is visible approx at 650-700 nm, therefore we must get the "inverted" color which will be 400-450 approx For max value, you will need to have the specific "dye" wavelength 2. List your data and calculated concentrations for your two unknowns: Kool-Aid Flavor Grape/ Black Cherry Std curve slope 0.00288216486 / 0.0007531953371 Y-intercept 0.01 / -0.13 Absorbance Concentration Concentration mg/l Absorbance (Unitless 431.62 0.128 647.43 0.201 863.24 0.269 1079.05 0.335 1294.86 0.372
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Concentration mg/l Absorbance (Unitless) 409.19 0.178 613.785 0.33 818.38 0.46 1022.975 0.653 1227.57 0.787 3. How does the wavelength of maximum absorbance relate to a substance’s color?
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