Absorbance 0.6 0.5 0.4 0.3 0.2 0.1 0.0 Molarity (M) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 0.1 0.2 Absorbance (at λmax) 0.093 0.188 0.278 0.363 0.456 0.560 0.636 0.3 0.4 0.5 Concentration (in Molarity) 0.6 a. it would increase by a factor of 4 b. it would double c. it would be cut in half d. it would decrease by a factor of 4 O 0.7 1. If the concentration of a solute were doubled, what would happen to the absorbance of the solution?
5. According to the experiment, what is the concentration of an unknown solution if A = 0.242? 8=1 a 0.197 M b. 0.240 M c. 0.258 M d. 0.289 M 6. Adding 50 mL of pure water to a 10 mL sample of solute would have what effect on the absorbance? a. the absorbance would decrease as the solute is diluted b. absorbance would remain unchanged because the amount of solute remains unchanged c. the absorbance would remain unchanged because the solution's density remains unchanged d. the absorbance would increase as volume increases 7. Which of the following would increase the accuracy and precision of measuring the solute concentration? a. running the experiment using different wavelengths b. using a bigger cuvette in order to increase pathlength c. adding more standard concentrations to the curve d. running multiple trials of each standard concentration
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