Concept explainers
(a)
Interpretation:
The compounds
Concept introduction:
Infrared spectroscopy or vibrational spectroscopy deals with interaction of infrared radiation with matter. Its frequency ranges from
(b)
Interpretation:
The compound
Concept introduction:
In mass spectroscopy, compounds are identified on the basis of mass of compound. When the compound breaks into fragments then they can be distinguished from the other compounds. This technique is also used to differentiate the isotopes of compounds. This technique does not involve
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EBK ORGANIC CHEMISTRY
- 2. ] You make 150.0 mL of a copper(II) sulfate solution but forget to cover it before leaving for the day. The next class, you measure the volume and find that you only have 132.0 mL remaining. You didn’t record the initial concentration, but you measure the absorbance of the remaining solution at 620 nm and find that it is 0.386. You also construct the following calibration curve for CuSO4: Standard solution Abs620 0.50 M 0.424 0.40 M 0.336 0.30 M 0.247 0.20 M 0.159 (refer to image) a. What is the value for k (in Beer’s Law)? Provide a calculation or graph to support your answer. b. What is the concentration of the (remaining) solution? c. What was the concentration of the original solution from the first class? d. If you removed 7.5 mL from the 132.0 mL solution in the process of measuring the absorbance, how much water should you add to obtain the original concentration that you solved for in part (c)?arrow_forwardWhat functional group and molecule can you get from its IR spectrum? Support your answer by identifying prominent peaks (wavenumbers cm^-1) and assigning the functional group.arrow_forwardChoose whether Atomic Absorption Spectroscopy (AAS) or Gas Chromatography Mass Spectrometry (GCMS) can be used to identify chloride-containing molecule with a boiling point of 250 oC. Explain your choice.arrow_forward
- C8H8O produces an IR spectrum with 3063, 1686, 1646 cm signals. HNMR is a singlet at 2.6ppm (3H), and multiplet at 7.5 (5H). What is the productarrow_forwardIf you read the ingredients list for Cherry Kool-Aid it also lists RD&C Blue 1 as a dye present in the Kool-Aid mix. Why do we not have to worry about the content of the blue dye when determining the concentration of the red dye? The spectra for FD&C Red 40, Blue 1 and Yellow 5 are shown below.arrow_forward1- While cleaning out a laboratory shelf, you have made a mistake in labeling two bottles of ethanol and acetic acid. To identify the molecular structure of the contents of the bottle, samples were submitted for analysis using infrared spectroscopy, based on the IR results, draw the molecular structure of the molecule that would correspond to the spectrum for that compound. Justify your answer Spectrum A Spectrum B 0. 04 0.2 3000 2000 Waverumber icm-1) 1000 Transmitancearrow_forward
- What structural features of Hydroxypropyl Acrylate (HPA) allow it to be detected by HPLC?arrow_forwardYou're in lab and there's a bottle of solvent that has a faded label. You want to dispose of it properly (chemical waste is always labeled by its contents.) You know it is either diethyl ether or n-butanol, but you don't want to measure boiling points to determine which it is so you take an IR spectrum instead. Infrared Spectrum 1.0 0.8 0.6 0.2 0.0 3500 3000 2500 2000 1500 1000 500 Wavenumbers (cm-1) Based on the IR spectrum shown above, what is in the bottle? O n-butanol O diethyl ether Referring to the IR spectrum, describe how you came to that conclusion: Enter your answer here Transmitancearrow_forwardHow can you distinguish aldehydes, ketones, and carboxylic acids from each other using IR spectra? Explain using specific examples.arrow_forward
- If a TOF mass spectrometer needs to scan an m/z of 600, what is the speed of this ion if it is accelerated through 4000 volts? How long will this ion (at the speed calculated) take to drift 2.00 m through the spectrometer? How many mass spectra can be taken each second if a new cycle begins each time this ion reaches the detector?arrow_forwardWhat is responsible for the small peak at m/z = 17 in the mass spectrum of CH4?arrow_forwardBe sure to answer all parts. Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. (a) A molecular vibration absorbs radiation of wavelength 28.3 um. What frequency (in s) corresponds to that wavelength? Enter your answer in scientific notation. x 10 (b) A molecular vibration has a frequency of vibration of 7.574 x 10" Hz. What wavelength (in um) corresponds to that frequency? umarrow_forward