You have carried out an experiment using the spectrophotometry concept. A solution containing compound X is mixed with reagent 1 and then reagent 2. This mixture produces a blue colour whose absorbance (A) could be read at 550 nm. The results are shown below If the standard solution (compound X) used have a concentration of 1 mM: 3. If the absorbance was read using 1 cm diameter cuvettes, calculate the molar extinction coefficient for compound X in the solution. State the unit for the coefficient. Assume each molecule of X produces one molecule of coloured compound

You have carried out an experiment using the spectrophotometry concept. A solution containing compound X is mixed with reagent 1 and then reagent 2. This mixture produces a blue colour whose absorbance (A) could be read at 550 nm. The results are shown below If the standard solution (compound X) used have a concentration of 1 mM: 3. If the absorbance was read using 1 cm diameter cuvettes, calculate the molar extinction coefficient for compound X in the solution. State the unit for the coefficient. Assume each molecule of X produces one molecule of coloured compound

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter14: Chromatography

Section: Chapter Questions

Problem 9P

See similar textbooks

Similar questions

Standardization of Sodium Thiosulfate Solution Primary Standard used: Potassium Dichromate Formula mass of 1o standard: __________________ % Purity of 1o standard: 99.80% Trials 1 2 3 Weight of K2Cr2O7 (g)Weight of K2Cr2O7 (g) 0.0315 0.0331 0.0380 Final Volume Reading Na2S2O3 (ml) 27.50 27.50 34.90 Initial Volume Reading Na2S2O3 (ml) 1.10 0.00 1.00 Net Volume Na2S2O3 used (ml) Molarity of Na2S2O3
1. Minimal OR Maximum 2. Impurities OR substances while Impurities OR substance remain… 3. Centrifuge OR Filter
1) determine the glassware that can be used to deliver 4.5mL with an absolute error: a) ≤ 0.15 mL b) ≤ 0.02 mL c) ≤ 0.07 mL
Table of caffeine standards concentration . Sample Conc, ppm Std1 16 Std2 32 Std3 48 Std4 64 Std5 80 If the volume used to make 100 mL of std 1 is 2 uL what is the concentration in M used to make std calibration curve ? The standards are going to be used to build calibration curve to analyze caffeine in an energy drink. if 500 mL of the energy drink has target of 400 mg , how will you prepare the sample if you need 10 mL for the analysis ? Caffeine MM=194.19 g/mol.
- attempt- Q5: Select the correct answer for the following multiple-choice questions: 1. Asphalt penetration test can measure a. Consistency b. Aging c. Tension properties d. Safety 2. An emulsifier is commonly used to produce a. Tack coat b. Prime coat c. Emulsified asphalt d. Tar 3. The quality of performance of a soil as a subgrade material and group index are a. Inversely proportional b. Not related c. Directly proportional d. All of the above 4. The sieve that separates fine and coarse aggregates in asphalt mixture design is d. No.40 c. No.10 5. Kerosene is used as a solvent to produce a. Tar b. Emulsified asphalt c. Cutback asphalt a. No.200 b. No.4d. Oxidized asphalt
Jody, a medical assistant in a small clinic, ran out of surface disinfectant while cleaning thecounters in the clinic laboratory. The label of the disinfectant bottle she was using containedinstructions for preparing the surface disinfectant from the concentrated stock solution. Theinstructions read “Dilute the concentrate 1:50 with water.” Jody was using a disinfectant bottlewith a 500 mL capacity. 1. 1. Jody should prepare the replacement surface disinfectant by:a. Adding 1 mL of concentrate to 50 mL of waterb. Adding 10 mL of concentrate to 500 mL of waterc. Adding 10 mL of concentrate to 100 mL of waterd. Adding 10 mL of concentrate to 490 mL of water
y= mx+ b Slope () = -4E-09 y-intercept () = 0.4021 and OD= 0.540 , Calculate the concentration (x)
The gravimetric factor used to express CoCBr6·H20 in a sample that is finally weighed as PbClBr is choose below: FW PbClBr / 6 x FW CoCBr6·H20 FW CoCBr6·H20 / FW PbClBr FW CoCBr6·H20 / 6 x FW PbClBr 6 x FW PbClBr / FW CoCBr6·H20
(6.65x10^5)/(6.60x10^-6) (3.73x10^8) Please Calaculition. Only typed solution
Please answer fast it’s very important and urgent I say very urgent so please answer super super fast please For the image attached For 1. a Mass of metal: Trial 1 is 35.0228 g Trial 2 is 35.0915 g Trial 3 is 34.0821 g Mass of water: Trial 1 is 20.0177 g Trial 2 is 20.0250 g Trial 3 is 20.0168 g For delta t of water: Trial 1 is 15.5 C Trial 2 is 15.7 C Trial 3 is 15.1 C For delta t of metal Trial 1 is 80.1 C Trial 2 is 80.2 C Trial 3 is 79.5 C For B my calculated Specific heat is: Trial 1 is 0.462 Trial 2 is 0.467 Trial 3 is 0.466
0.2 to 1.0 mg/ml: For each concentration, a volume of 1.0 mL should be prepared. How will you prepare these standards using micropipettes and which one would you use? There is a: 0,5-10 microliter pipette; 2-20 microliter pipette 20-200 microliter pipette 100-1000 microliter pipette.
I would need help with these questions. The method referenced above was followed by a student and she got the following results: Caffeine Std. Conc. (ppm) Absorbance 100 1.806 50 0.899 40 0.724 30 0.545 20 0.365 10 0.183 Further, she analyzed an unknown sample and she got the following results: Sample # Absorbance 1 0.398 1. Graphically find the concentration in ppm and then calculate in mol/L of Caffeine in Sample #1? 2. Which solvent was used to extract Caffeine and why? Why is it necessary to do extraction three times? 3. Cuvettes used in this experiment were made from which material and why? 4. At what wavelength the Absorbance was measured?