Absorbance vs. Concentration y = 0.2755x 0 0.200 0.400 0.600 1.000 1.200 1.400 1.600 1.800 2.000 Concentration (M) sing the calibration curve, calculate the molar concentration for a solution with a measured absorbance of 0.374. Round your answer to 3 significant digit 10 10 Concentration = M St Absorbance 0,7- 0,6- 0.5- 0.4- 0.3 0.2- 0.1- 0.800 X

Absorbance vs. Concentration y = 0.2755x 0 0.200 0.400 0.600 1.000 1.200 1.400 1.600 1.800 2.000 Concentration (M) sing the calibration curve, calculate the molar concentration for a solution with a measured absorbance of 0.374. Round your answer to 3 significant digit 10 10 Concentration = M St Absorbance 0,7- 0,6- 0.5- 0.4- 0.3 0.2- 0.1- 0.800 X

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions

Section: Chapter Questions

Problem 77PS

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Solution. Vol. of A solution (mL) [methyl red], M Absorbance 1 10.00 _1.64 x10^-16_ _0.256_ 2 15.00 _2.45 x10^-16_. _0.373_ 3 20.00 _3.27 x10^-16_. _0.486_ 4 25.00 _4.09 x10^-16_. _0.620_ Plot a graph of the absorbance (y axis) as a function of the concentration of methyl red (x axis). What is the slope of the graph?
explain the results of this experimet Table 2 Absorbance vs CoCl2 concentration Test Tube Number Cobalt Chloride Concentration (mol/mL) Absorbance at 510 nm 1 0.000 0.000 2 0.009 0.024 3 0.018 0.055 4 0.027 0.085 5 6 0.036 0.045 0.112 0.138 7 (Unknown) 0.088
For the determination of Fe3 +, 25 mL of sample taken from sea water is diluted to 100 mL and a quantity of the obtained solution is taken and Fe3 + is determined by atomic absorption spectrophotometer. The absorbance values of the standard and sample solutions are below, and calculate the Fe3 + concentration in sea water in mg / L by drawing the relevant graph.Solution Absorbance1 mg / L Fe3 + 0.04095 mg / L Fe3 + 0.205110 mg / L Fe3 + 0.411615 mg / L Fe3 + 0.620820 mg / L Fe3 + 0.8222Sample Solution 0.5155
A toluene solution (1.50 mg / L) shows an absorbance of 0.30 in a cuvette with a 0.025 mm optical path. Calculate the limit of detection (in ppb) for toluene if the noise with the solvent spectrum is 0.002 absorbance units in a 0.050 mm cuvette.
A 131.7 mg sample of powdered Carbamazepine tablets was boiled with ethanol, filtered and then made up to 100 mL with ethanol. 5 mL of this solution was then diluted to 250 mL with ethanol and the absorbance at 285 nm found to be 0.486 in a 1cm path length cell.Calculate the content (% m/m) of Carbamazepine in the powder, taking A(1%, 1 cm) as 490.(State your answer to 1 decimal place and include the units)
Preparing a standard curve. 1. determine the absorbance max of [FeSCN]2+ it is 448.1 2. determine the concentration of FeSCN2+ in the stock solution. M1V1=M2V2 stock solution: ~0.200 M iron (iii) nitrate in 1M nitric acid intial volume: 0.3mL final volume: 10.3mL volume: 10mL ~0.002M potassium thiocyanate initial volume: 0.3mL final volume: 10.3mL volume: 10mL not sure if this is needed stock solutions: ~0.200M iron (iii) nitrate in 1M nitric acid: 0.207M ~0.002M iron (iii) nitrate in 1M nitric acid: 0.00209M ~0.002M potassium thiocyanate: 0.00193M
The absorbance for a dye sample of unknown concentration is measured and the corrected absorbance is 0.666. The standard curve created is found to have this linear equation: y = 0.153x + 0.043 Calculate the concentration (ug / mL) of the dye sample. 4.54 3.33 4.07 5.17 2.07
A student completed Test Solution 1: 2.5 mL of 2.00×10−32.00×10−3 M Fe(NO3)3Fe(NO3)3 mixed with 0.5 mL of 2.00×10−32.00×10−3 M NaSCNNaSCN and topped with 2.0 mL of 0.1 M HNO3HNO3 to make a total of 5.0 mL solution. The absorbance of the solution was measured, and the calibration curve was used to calculate [FeSCN2+][FeSCN2+] at equilibrium. Concentration of [FeSCN2+][FeSCN2+] at equilibrium was 7.5×10−57.5×10−5 M. Complete the given chart and the calculation that follows. initial [Fe3+], M2= initial SCN[Fe3+], M2= M Fe3+Fe3+ + SCN−SCN− ↽−−⇀↽−−⇀ FeSCN2+FeSCN2+ Initial Change Equilibrium Calculate the equilibrium Kc for this reaction (to two significant figures
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To test a spectrophotometer’s accuracy, a solution of 60.06 ppm K2Cr2O7 is prepared and analyzed. This solution has an expected absorbance of 0.641 at 350.0 nm. Several aliquots of the solution produce the following absorbance values. 0.640    0.638    0.640    0.639    0.640    0.639    0.638 is there any significant difference between the experimental mean and the expected value at a 99.9% confidence level? Question 21 options: Yes because tcal<tcritical Yes because tcal>tcritical No because tcal<tcritical No because tcal>tcritical
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