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What is quantitative transfer and why is it used?
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- 6. The concentration of caffeine in an energy soft drink was determined by standard addition using HPLC. The following procedure was used: a standard caffeine solution was prepared by adding 0.09850g of caffeine to 25.0 cm3 of water.A series of solutions were prepared by adding known volumes of the standard solution to the soft drink before diluting to 100 cm3. The volume of standard and the caffeine peak area are shown in the table: Energy Drink (cm3) Added caffeine Std (cm3) Peak area 15 0 965 15 5 1352 15 10 1739 15 15 2126 15 20 2513 Determine the concentration of caffeine in the soft drink as mg cm-3. A. 3.3 B. 2.3 C. 4.3 D. 7.3Chemistry The levels of an organic pollutant (P) in the groundwater at the perimeter of a plant were a cause for concern. A 10 mL sample of the water was taken and the pollutant was extracted with 95% efficiency using 25 mL of diethyl ether. GC was used to analyse the concentration of P in diethyl ether. A calibration curve was plotted for a series of standards of P which yielded the following results: Peak Area Toluene Conc. (µg/ml) 12,000 2.6 23,700 5.0 35,500 7.7 46,800 9.9 31,250 Sample Determine the concentration of P in ppb in the initial groundwater sample.(please type answer no write by hend)
- 8.0 cm 5.8 cm 3.9 cm 1.5 cm A B C D Figure 2. Developed TLC plate of commercial analgesic and standards Use the data presented in Figure 2 as basis for your answer. The TLC plate used is 5 cm by 10 cm. Note that dot A is for the commercial analgesic, dot B is for the aspirin standard, dot C is for the acetaminophen standard, and dot D is for the caffeine standard. What component/s islare present in the commercial analgesic as confirmed on the developed chromatograph?Need helppercentage purity of an ibuprofen sample was determined by a reversed phase HPLC method as follows: Y Der ● A calibration curve of peak area versus concentration (ug/mL) of pure ibuprofen was constructed The ibuprofen sample for analysis was prepared by taking 10.0204 g of powder and dissolving it in/1Lbf distilled water (solution A). 1 ml of the latter solution was further diluted to IL with distilled water (solution B). Solution B was analysed by HPLC analysis Results The equation for the best-fit line of the calibration curve is: y=26820x-1323.8. ● The average peak area for the ibuprofen sample (solution B) was 266796.2 Calculate the percentage purity of the ibuprofen powder.
- Which is more accurate, a transfer pipet or a measuring pipet? How much is the uncertainty in microliters when you deliver (a) 10 !L or (b) 100 !L from a 100- !L adjustable micropipet?A volume of 250 ml of a 0.05 M solution of a reagent of formula weight (relative molecular mass) 40 was made up, the weighing being done by difference. The standard deviation of each weighing was 0.0001 g. 1 (a) What were the standard deviation and relative standard deviation of the weight of reagent used?°F rtly cloudy m/alekscgi/x/Isl.exe/1o_u-lgNslkr7j8P3jH-lvWyv8WYLP6W0cqJcWJdIACROQwyw24GWHInMM72ts 1 NTBcSzwZOGGhrmIP4yCejeRhX9HIzqlzRTj2iaDBXTCRIHYWNO_-o?10... O CHEMICAL REACTIONS Calculating molarity using solute moles A chemist prepares a solution of mercury(II) iodide (HgI₂) by measuring out 0.0161 μmol of mercury(II) iodide into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in μmol/L of the chemist's mercury(II) iodide solution. Round your answer to 3 significant digits. µ mol L Explanation Check x10 X Ś Q Search 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use **************** D 1/5 www Jessi Privacy Center | Accessibility
- A quality-control laboratory analyzes a product mixture us-ing gas-liquid chromatography. The separation of components ismore than adequate, but the process takes too long. Suggest twoways, other than changing the stationary phase, to shorten theanalysis timeThird Ma X 占 General A General ( X di General ( N 7C Social x C Clever | P x C Clever | P X E Edulastic x O Mail - AS x A app.edulastic.com/student/assessment/60525b29af74cf0008c2b68f/class/5f20cf3d5dd16ded17965e85/uta/6054999e58acf20009db46a4/it Question 1/19 > NEXT A BOOKMARK The structure of a chromosome is made up of influences our traits. 1 which contains that code for a which A Protein, DNA, Gene B Gene, DNA, Protein C DNA, Genes, Protein O Type here to search DELL 立Convert ppm to mM and meq/L
