Why should you use deuterated solvents such as CD3OD and CDCl3 instead of non-deuterated solvents such as acetone and methanol to dissolve organic compounds for NMR analysis?
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A: Answer: 5.55 x 102 g
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Q: Give the IUPAC name for the following compound: H CH2CH3 CH2CH2CH3 H3CH2CH2CH2C CH2CH3 CH2CH3
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Why should you use deuterated solvents such as CD3OD and CDCl3 instead of non-deuterated solvents such as acetone and methanol to dissolve organic compounds for NMR analysis?
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- Interpret the NMR spectra and identify these compounds: choices: 4-Chloroacetanilide Diphenylmethanol Ethyl 4-hydroxybenzoate Phenacetin 2-Chloroacetanilide include integration number and multiplicityWhat is the structure of this molecule and ignore the 77 ppm triad in Csrbon-13 NMR. Mass of structure is 162.Use the supplied NMR spectrum to gain insight into salicylic acid. Decipher the spectrum by assigning hydrogen peaks in the molecule and include it with your report. CO₂H OH 11.5 11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
- Determine structure. Ignore the 77 ppm in the Carbon 13 NMR. Atomic Mass of structure is 87 gInterpret the NMR results in terms of purity. What should a chemist do to improve the yield or purity of the product? Discuss the key parts of the NMR for the starting material and pure product. Focus on the peaks that show up after 3 ppm. For the starting material, discuss what those 2 peaks (around 3.5 ppm and 4.7 ppm) correspond to in the structure of cyclohexanol. For the pure product, discuss why those 2 peaks are missing, and there is a new peak for 2H at around 5.6 ppm. Then, discuss the NMR for your actual product from the reaction. Does it contain pure product? If not, what else is there? How do you know this based on the NMR? Based on your understanding of the reaction and LeChatelier’s principle, how can you improve the reaction yield? How can you better purify the reaction product?How do we detect organic compounds and inorganic compounds used in GC analysis?
- Sally obtains a standard calibration curve for their assigned food dye by plotting absorbance versus concentration (in M) of known solutions and finds the following slope and intercept: y = 1.646x + 0.026 Note: Copying and/or posting this or other questions without the express written permission from Dr. Burke and the Department of Chemistry & Biochemistry at the University of Delaware is a violation of intellectual property copyright law. Sally finds that her original Kool-aid sample is too concentrated, so they dilute it by transferring 13.00 mL of the original Kool-aid sample into a new container and diluting to a total volume of 37.00 mL. If the absorbance of the dilute Kool-aid sample at the appropriate wavelength for their assigned dye is 0.950, determine the concentration (in M) of the assigned food dye in the original Kool-aid sample. Report your answer with three places after the decimal.Compound CsH12 gives the following H-NMR. Draw the structure of the compound. Draw a box around the structure you want graded. 5.00 1.00 6.04 70 6.5 6.0 4.0 3.5 3.0 25 20 1.5 A student was adding bromine across the double bond of 2-butene to make 2,3-dibromobutane. After taking the NMR, the student discovered they didn't get the product expected. Based on the NMR, what product did they obtain? Draw a box around your answer. 1.00 2.01 |2.00 3.00The NMR spectra for compound 1 were acquired in a 10 mg / 0.6 mL solution of CDCl3. The 1H and 13C peaks are also listed below.Provide a full analysis of the NMR spectra for compound 1.1H NMR (400 MHz, CDCl3) δ 5.94 (dd, J = 17.3, 10.8 Hz, 1H), 5.24 (dd, J = 17.4, 1.2 Hz,1H), 5.14 (tt, J = 7.1, 1.5 Hz, 1H), 5.08 (dd, J = 10.8, 1.3 Hz, 1H), 2.05 (p, J = 7.3 Hz, 2H),1.70 (s, 3H), 1.63 (s, 3H), 1.60 – 1.57 (m, 2H), 1.30 (s, 3H).13C NMR (100 MHz, CDCl3) δ 145.05, 131.98, 124.32, 111.69, 73.49, 42.06, 27.89, 25.71,22.81, 17.70.Note: from the data given, the two terminal methyl groups are impossible to differentia
- Compound X was dissolved in a 5-mL volumetric flask. A 1.00-mL aliquot of the compound was placed in a 10-mL volumetric flask and diluted to the mark. The solution was read in a UV-Vis spectrophotometer and an absorbance of 0.427 in a 1.000-cm cuvette was observed at 340 nm. Solve the following question. Data for Compound X:Molecular mass = 292.16 g/molMolar absorptivity (ɛ) at 340 nm= 6130 M -1 cm -1 a. Calculate the concentration of compound X in the cuvette. b. How many milligrams of compound X were used to make the 5-mL solution?An analyst was told to determine the amount of glucose in blood using a colorimetric method. The analyst prepared a series of standards containing known amounts of glucose and obtained the results given in the table below by UV/visible spectroscopy. Concentration of Glucose/mmol L-¹ 0.0 2.0 4.0 6.0 8.0 10.0 12.0 Absorbance 0.11 0.25 0.45 0.63 0.87 1.05 1.24 Use the data in the table to plot a graph of absorbance against glucose concentration. a) Is Beer's Law obeyed? b) From the best fit line, calculate the molar absorptivity, &, and its units. c) If a urine sample has absorbance = 0.53, use your graph (not any individual data points) to determine its glucose concentration.How can you distinguish aldehydes, esters and carboxylic acids using IR spectra? Explain using specific examples.
