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3 cards from this section. Quick, good the night before a test.
What is the definition of molar absorptivity?
Think about light absorption when looking at concentrations.
Calculate the mean of the following volumes: 25.00 mL, 25.02 mL, 25.01 mL.
Add all volumes and divide by the number of measurements.
What does Beer’s Law state?
Consider how solutions behave when diluted.
True or False: The mean equivalence volume is always equal to the individual volume measurements.
Recall the properties of average values.
During a titration, the equivalence volumes measured were 25.15 mL, 25.10 mL, and 25.05 mL. Calculate the mean equivalence volume and its uncertainty. Next, calculate the amount of NaOH used to neutralize the HCl if you have 0.1000 M NaOH.
Start by summing the volumes and then dividing by the number of trials.
You have absorbance data of a dye you used in a UV-Vis calibration curve as (0.110 for 1 mg/L, 0.220 for 2 mg/L... etc.). Plot the data and determine the slope to find the molar absorptivity. Then, find the concentration of an unknown with 0.550 absorbance.
Plotting tools can reveal trends in your data.
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