QUESTION 10 An impure aqueous sample of I was extracted with ether. The ether layer was then extracted with 0.1 M HCI. Which layer will contain the compound after the second extraction? NHz A. both, because I is soluble in both, 0.1 M HCI and ether. B. ether layer O C. none, because I doesn't dissolve in ether in the first extraction. D. aqueous layer (0.1 M HCI)
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- Match the following methods to their endpoint. * B. Appearance of the first C. A distinctive color to the A. Brick red ppt turbidity or white surface of the precipitate precipitate O O O O Gay-Lussac Liebig Mohr Volhard Fajan O O O O O D. Flesh supernatant liquid with a white precipitate O O15. What is the dilution factor for 40 uL of sample added to 200 uL of diluent?To prevent inclusion from occurring during precipitation, the technique to follow is I. filter precipitate with less porous paper II. crystal growth be made to occur more slowly II. use of dilute analyte with concentrated precipitant IV. addition of soluble electrolyte O I & II I O I l only O Iv only O II & IV O I only
- QUESTION 4 To prevent inclusion from occurring during precipitation, the technique to follow is I. fiter precipitate with less porous paper II. crystal growth be made to occur more slowly III. use of dilute analyte with concentrated precipitant IV. addition of soluble electrolyte O lonly IV only O I| & IV O I & III Il onlyFollowing the monograph procedure, a 724-mg of aspirin (MW=180 g/mol) dissolved in 18.5 ml of cold neutralized alcohol. This solution was then initially titrated with 0.101 N sodium hydroxide solution, then later neutralized with 0.104 sulfuric acid. 1. What is the total volume (mL) of excess titrant used in the titration? a. 56.400 mL b. 52.000 mL c. 44.600 mL 2. What is the milliequivalent weight consumed by the acidic titrant? a. 1.5392 g-meq b. 2.0907 g-meq c. 1.4948 g-meq d. 2.1528 g-meq 3. What is the milliequivalent weight consumed by the basic titrant? a. 5.8656 g-meq b. 1.5392 g-meq c. 5.6964 g-meq d. 1.4948 g-meq 4. What is the difference of milliequivalent weight consumed in the reaction? a. -4.1572 g-meq b. 4.3708 g-meq c. 0.5515 g-meq d. 4.1572 g-meq 5. What is the percentage purity of the sample? 6. What is the titer value (mg) based from the specific type of titration?20. The possible reason for the ignition of gravimetric precipitate is I. for its mass to be lower II. to decompose the solid and form a compound of known composition III. to remove the solvent and any non-volatile species IV. to perform post-precipitation A. I only В. П only С. II only D. I & II E. II & III F. П, I, & IV
- 1. CaCO3 + O2 ------- CaCO2 + CO2, CO2 in lime water solution formed ________. precipitate H2 gases bubbles 2. The visible results and observation of the Zn metal + 6 M HCl is __________. Zn metal readily dissolved Zn metal partially dissolved No reactionHow 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 10017. This type of analysis implies that the constituent determined was present in very, very low concentration. a. Macro analysis b. Semi-macro analysis c. Micro analysis 18. Which of the following does not happen during digestion? The crystals dissolve and re-precipitate under equilibrium conditions. b. Weakly bound water are lost from the precipitates. c. Filterability improves d. None of the choices
- Is prepared by dissolving a definite weight of a substance in a definite volume. a. primary standard b. secondary standard c. standard addition d. standard sample e. standard solution1. One of the methods of eliminating interferences, is by adding solvents to the solution in which components to be removed are soluble, which method is this? a. Complexation b. Extraction lon-exchange d. Precipitate С. 2. Which of the following properties of precipitates is desired in gravimetry? a. Large b. Pure С. Free of contaminants d. All of the choices3. It is used to convert the known weight of the precipitate to the corresponding weight of the analyte. a. Gravimetric factor b. Mole ratio c. Mass ratio d. All of the choices 4. Which of the following is used to express the ppm of the solution? a. Kg analyte/liter solution b. Mg analyte/liter solution x 10^6 G analyte/ g sample x 10^6 d. Kg analyte/kg sample C.