In a variation on the “secret recipe” part of this lab, one student secretly mixed together two…

In a variation on the “secret recipe” part of this lab, one student secretly mixed together two different colors of solution and gave the mixture to another student to analyze. The student placed the sample in the MicroLab spectrophotometer and obtained the following graph of absorbance vs. wavelength. absorbance 400 430 460 500 540 580 620 660 700 viol indg blue grn gr-yel yel org red red wavelength (nm) Which two colors had the first student secretly mixed together? I.e. what did the two solutions look like before they were mixed together? It may help to consult a color wheel or a color

»In a variation on the “secret recipe” part of this lab, one student secretly mixed together two different colors of solution and gave the mixture to another student to analyze. The student placed the sample in the MicroLab spectrophotometer and obtained the following graph of absorbance vs. wavelength. absorbance 400 430 460 500 540 580 620 660 700 viol indg blue grn gr-yel yel org red red wavelength (nm) Which two colors had the first student secretly mixed together? I.e. what did the two solutions look like before they were mixed together? It may help to consult a color wheel or a color star. Red Red- violet Violet Red- orange Orange Red Red- violet Violet Red- orange Orange Blue- violet Yellow- orange Blue Yellow Blue- green Yellow- green Green The two solutions were violet and green before mixing. The two solutions were blue and red before mixing. The two solutions were blue and yellow before mixing. The two solutions were orange and violet before mixing. The two solutions were violet and red before mixing. Students prepared a calibration curve using standard solutions of a certain dye. Measuring the absorbance of an appropriate wavelength of light for each standard allowed making the following calibration curve for that dye. absorbance of solution at 502 nm 1.50 1.25 absorbance 0.50 0.25 0.00 0.00 0.40 0.80 1.20 1.60 2.00 2.40 ° 0.50 0.25 0.00 0.00 0.40 0.80 1.20 1.60 solution concentration (ppm) 2.00 2.40 Students then tested an unknown sample. If that sample had transmission of 11.2% (T = 0.112), what is the concentration of that sample? 1.50 ppm 0.60 ppm O 0.95 ppm 1.75 ppm 0.15 ppm

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