Question 11:
a.) What is the absorbance, A, of a 0.0120 M solution with a percent transmittance of 46.0%? A=____
b.) Suppose the concentration of the solution is doubled to 0.0240 M. What is the percent transmittance of the 0.0240 M solution? T= ____%
Question 11: a.) What is the absorbance, A, of a 0.0120 M solution with a percent...
Please answer both 24 & 27
22. Calculate the pH of a 0.0120 M lactic acid solution. HC3H5O3, K = 1.36x10 23. Find the pH of 0.388 M lithium butanoate solution, LIC,H,O,(aq). Butanoic acid Kg = 1.52x10° 24. Calculate the percent ionization for a 0.0240 M hypochlorous acid solution. The K, for hypochlorous acid is 3.4x10 25. Nicotine is a weak base (C10H24N2, Kb = 1.0x10'). A researcher prepares a solution containing 0.300 M nicotine and 0.050 M NaOH. Determine...
What absorbance value corresponds to 47.3% T'? A = A 0.0150 M solution of a certain analyte exhibits 47.3% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0250 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T =
What absorbance value corresponds to 47.1% T? A 0.0188 M solution of a certain analyte exhibits 47.1% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0281 M solution of the same analyte? Assume the pathlengths for each measurement are equal.
What absorbance value corresponds to 41.1% T? .386 A 0.0142 M solution of a certain analyte exhibits 41.1% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0284 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T
A solution of 0.0001 M nitroaniline has an absorbance of 0.45 at 410 nm. What is the percent transmittance to the nearest whole number (do not write units for your answer)
What absorbance value corresponds to 41.8% T? A = A 0.0110 M solution of a certain analyte exhibits 41.8% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0299 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T =
POST LABORATORY QUESTIONS solution appears to be orange, what range of wavelength would you use for analysis of the solution? I. a. Ifa b. How about if the solution was green-blue? 2, a. what absorbance corresponds to a percent transmittance of 59.6 % T? b. What is the percent transmittance for a solution that has an absorbance of 0.49? 3. At a wavelength of 510 nm a 0.12 M solution of CoCla gave a percent transmittance value of28.9 %. The...
9. A solution has an absorbance of 0.85 at a given wavelength. What is the percent transmittance of a solution that is twice as concentrated at that wavelength (assuming the Beer-Lambert law applies)? a) 28% b) 7.1 % c) 2.0% d) 14% e) 4.0 % f) 1.0%
Question 3 (1 point) A student plots a graph of absorbance on the y axis and concentration on the x axis, generating a regression line of y = 2795x -0.0125. What is the concentration of the absorbing species in solution, if the percent transmittance is 42.8? 1.36x10-4M 1.27x10-4 M 8.404x10-4 M 1.55x10-4 M.
Experiment #9 Post-Lab Problems (continue): 4. If a 0.060 M sample of Co(NO3)2 gave an absorbance of 0.29 at 500 nm in a 1 cm cell. What is the cobalt concentration of a solution giving and absorbance of 0.14 in the same cell at the same wavelength? 5. How are percent transmittance and absorbance related mathematically? What would be the absorbance of a sample with 13% transmittance?