Using known solutions of cobalt(II) nitrate, you will construct a graph of: Wavelength vs. concentration Moles vs. wavelength Moles vs. transmittance Absorbance vs. concentration Absorbance vs. transmittanc The Beer-Lambert law tells us that concentration and absorbance are: Proportionally related (as one increases, the other increases) Inversely related (as one increases, the other decreases) Which of the following should help to prevent error in your colorimetric measurements? Ensuring that finger prints are not on the cuvette sample holders. Washing the cuvette with sample solution after washing with water and before filling the cuvette with that solution. Making careful and precise volume measurements from the same known solution. All of these. How many solutions of different known concentration should you prepare for making your standard plot? None 1 2 3 At least 7 In the Beer-Lambert Law equation, what does the "b" represent? Concentration Absorption y-intercept Buoyancy Thickness of solution If the solutions you are analyzing by colorimetry are blue, which of the following wavelengths of light would be the better choice for your experiment? 440 nm (blue light) 650 nm (orange light) If a solution of Co(NO3)2 has a concentration of 0.10 M, how many moles are contained in 500.0 mL of this solution? 20 mol 0.20 mol 0.050 mol 0.10 mol 50 mol If 2.0 mL of water is added to 8.0 mL of a 0.30 M solution to make a new solution with a total volume of 10.0 mL, what is the concentration of the new solution? 0.060 M 0.24 M 1.2 M 1.6 M 0.18 M

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Sep 13, 2020

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