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Can you tell me if I am doing this correctly? For the thermoeter correction, we are given that: literature value of standard - experimental value of standard at end of melting temperature.
I found online that the melting range of pure acetanilide is 113-115. From there I calculated the therometer correction.
|
Substance
|
Melting Point Range Begins/Ends (oC) |
Interval of Melting (oC) |
Thermometer Correction for Calibration Data (oC) |
Corrected Melting Point (oC) |
|
Crystallized acetanilide Trial #1
|
111.9 – 112.9 |
1.0 |
2.1 |
|
|
Crystallized acetanilide Trial #2
|
111.0 – 112.3 |
1.3 |
2.7 |
|
|
Crude acetanilide
|
112.9-115.4 |
2.5 |
-0.4 |
|
|
Acetanilide standard Lot #
|
115.6-116.5 |
0.9 |
-1.5 |
N/A |
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- Structural elucidation of a sample component is possible through point estimation of its components with modern instrumentation methodologies. Additionally, characterization of their chemical nature is possible through qualitative analytical methods. A - If the first statement is TRUE and the second statement is FALSEB - If the first statement is FALSE and the second statement is TRUEC - If both statements are TRUED - If both statements are FALSEAs a newly appointed research officer, Marissa has been assigned a task to separate a mixture containing acetone, acetamide and 1,2-dichloroethane using a high-performance liquid chromatography (HPLC) technique. The instrument was equipped with a 40-cm column packed with cyano propyl bonded to the siloxane backbone material. i) List THREE (3) examples of mobile phase solvent/solvent systems that can be used with the column above. ii) Determine the sequence in which the three analytes eluted from the column and explain the underlying principle applied. iii) Sketch the chromatogram that would be produced if the column was replaced with a column filled with C18 hydrocarbon bound to the siloxane backbone material and acetonitrile was employed as the mobile phase. Label the peaks observed.A juice concentrate was colorimetrically assayed using Nelson’s test. One milliliter (1.00 mL) of the sample solution and various concentrations of the standard glucose solution were treated with freshly prepared Nelson’s reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbances at 480 nm for distilled water, glucose standard, and for the sample are 0.052, 1.702, and 0.926, respectively. What is the reducing sugar concentration (mg/mL) in the juice concentrate? The equation of the line was plotted to be: y = 1.6656x - 0.0885 0.578 mg/mL 577.9 mg/mL 57.7 mg/mL 5.78 mg/mL
- Below is a chromatogram observed from chemical separation of chlorinated pesticides using gas chromatography. Water samples were pre-treated using solvent extraction technique prior to injection into GC. Complete the statements below so that the sentences will be accurate and logical. Gas chromatography coupled with __________ __________ detector is suitablefor chlorinated pesticide analysis. ii. Peaks that emerge first will represent compounds that are the most __________.Those compounds will also likely have low boiling points and show the leastinteractions with the stationary phase. iii. Major peaks start to emerge after 24 minutes. Heating the GC oven containing the column will likely __________ the time of chromatographic separation. iv. The peak height or area of an analyte is used to determine its __________ in quantitative analysis.Despite their structural differences, separation of mixtures of organic compounds (such as the arenes benzoic acid, 4-t-butylphenol, and benzamide) often proves difficult. Silica gel chromatography, however, can be used with some success provided that an appropriate solvent is used to provide optimal separation. Consider, for example, the TLC plate pictured at right after developing and UV visualization where prior to elution, lanes A and B were spotted with 4-t-butylphenol and lanes B and C spotted with benzamide. Which of the following must be true? In the space provided, indicate the CORRECT answers (as 1, 2, and/or 3) then explain your reasoning for all three statements. Benzamide elutes faster than t-butylphenol. The Rf for t-butylphenol is less than that of benzamide. Benzamide is more polar than 4-t-butylphenolThe label is a reagent to which he had specified on the label only the alcohol name and molecular formula of the same which was C4H10O. At the beginning of the experiment, about 50 mg reagent was diluted in deuterated chloroform with standard internal TMS and then added a specific vial (tube) for analysis of 1H and 13C spectra. When operating the equipment and ending the experiment, the teacher of discipline two being a spectrum of each 1H and one of 13C, and requests that they indicate which structure was responsible for those chemical spectra. Do you know those hired to the students who are here, qualify the structure of the referred responsible for the set of 13C and 1H spectra, as requested by the teacher. Figure 1: 1H spectrum of the unknown Figure 2: 13C spectrum of the unknown reagent
- Internal standard. When 1.06 mmol of 1-pentanol and 1.53 mmol of 1- exanol were separated by gas chromatography, they gave relative peak areas of 922 and 1 570 units, respectively. When 0.57 mmol of pentanol was added to anunknown containing hexanol, the relative chromatographic peak areas were 843:816 (pentanol:hexanol). How much hexanol did the unknown contain?What part fo chromatography is being descibe by the following? a phase that is fixed in place either in a column or on a planar surface a phase that carries the analyte mixture The portion of the mobile phase, which carries the sample components through the staionary phase combination of the mobile phase and the separated analyte out of the stationary phase A. eluate B. Stationary phase C. mobile phase D. eluentpercentage recovery of benzoic acid is 77.18%. The melting point range of crude benzoic acid = 112-119°C and the melting point range of pure benzoic acid (crystals) = 122-125. Comment on the percentage recovery of benzoic acid. Comment and compare the melting point of the crude and crystal samples
- Your manager has asked you to develop an analysis method for an ingredient in a perfume product being developed for the cosmetic industry. The ingredient has a high vapor pressure. The lab has instrumental analysis equipment. The manager specifies that in addition to the method being accurate, precise, and specific for the ingredient, it should be inexpensive and generate minimal chemical waste. Select the most promising analysis technique based on the information provided. a) Gas Chromatography (GC) with Flame Ionization Detection b) Liquid-liquid Extraction with Infrared Spectroscopy c) Gel Electrophoresis d) HPLC with Evaporative Light Scattering DetectionI) Sketch the apparatus set up for the chromatographic technique used byIman. Use the correct chromatographic terminologies to label all of theapparatus, materials, and phases. II)Predict the sequence of elution when the mixture was loaded onto theseparation column. Justify your answer. III) After the first compound was eluted, Iman discovered that the secondcompound was taking too long to pass through the column. Please suggestany strategies that could be used to aid the elution process. Justify youranswer.Of Aspirin, ethanol, acetaminophen, ethyl acetate, hexane, and water which could go undetected during HPLC analysis, but could result in a lower than expected melting point, why are they not detected by HPLC analysis?
