You have 100 mL of solvent available to do an extraction. Which will give a better separation? a. 1 extraction with 100 mL b. 2 extractions with 50 mL c. 5 extractions with 20 mL d. 3 extractions with 25 mL
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You have 100 mL of solvent available to do an extraction. Which will give a better separation?
a. 1 extraction with 100 mL
b. 2 extractions with 50 mL
c. 5 extractions with 20 mL
d. 3 extractions with 25 mL
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- Color BEFORE adding Color AFTER adding Intensity of color AFTER adding FeCl3 Test Tube # FeCl3 FeCl3 #1 (salicylic acid) clear lilac 100% #2 (commercial aspirin A) clear slightly pink 50% #3 (commercial aspirin B) clear lilac 95% #4 (aspirin from your clear pink 20% synthesis above) #5 (control) clear clear 0% Based on this data and the melting point of Aspirin, how pure is the synthesized product?Which statement is valid when the multiple extraction and single extraction is compared. The effciency of multiple extraction and single extraction is incomparable. Single extraction and multiple extraction have the same effciency Multiple extraction is more efficent than single extraction Single extraction is more efficient than multiple extraction5. Which term is INCORRECTLY defined? a. linear range - the range over which the response of an analytical method is proportional to analyte concentration b. dynamic range concentration range over which there is a measurable response to analyte, though the response is not linear c. blank solution - a solution containing all reagents and solvents used in the analysis to which no analyte is deliberately added d. standard solutions - solutions for which the standard deviation is known - 6. True or False: Internal standards correct random error caused by run-to-run variation. a. True b. False
- ▪ In a blood alcohol analysis by GC-FID, methanol elutes at 1 min, ethanol at 2 min, IPA at 3 min, and IS at 4 min. In the patient sample, the analyte elutes t 2 min and the IS at 8 min. What is the relative retention time and the analyte in the patient? A) methanol B) Ethanol chu C) IPADefine Extraction in chemistry ?From a 10-mL sample, a 1-mL aliquot was taken and diluted to 100mL. From this, a 5-mL aliquot was taken and diluted to 20mL.The final 20mL was found to have a concentration of 0.004M analyte X.What is the concentration of analyte X in the 10-mL sample?
- What is an advantage of Gas Chromatography and Mass Spectrometry (GS/MS). a. It is time consuming. b. It is labor intensive. c. It provides the most accurate confirmation of indentification. d. Substances with high boiling points are not compatible.D. Solvent Extraction Samples Upper phase Lower phase Oil + Water Kerosene + OilHow many uL of 5000 ppb standard would you use to fortify 50 mL of matrix to achieve a spike of 10 ppb? OA. 0.1 B. O C. O D. 1 10 100
- 3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.4. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.How many grams of NaAsO, should be weighed out to prepare a stock solution of 100 mg/L in 500 mL deionized water. Use the stock solution to prepare 4 different standard solution that can be used to prepare an analytical calibration curve to measure the concentration of 750 sample in the concentration range of 10-35 mg/L. Draw a proposed calibration curve (based on the results you achieved).