4. Could you use methanol instead of methylene chloride to do a liquid-liquid extraction of an aqueous solution? Briefly explain why or why not. T5-12

Extraction of Caffeine Post-lab   9. A 12 oz can of Coke contains 46 mg of caffeine. One fluid ounce is equivalent to 29.57 mL(1 oz = 29.57 mL). What is the concentration of caffeine in Coke, in units of mg/mL? Showyour work. 10. What is an alkaloid?   11. Why is anhydrous sodium carbonate used in isolation of Caffeine? What do youthink would happen if we used it during our simulation?

Five grams of an organic solid is dissolved in 100 ml of H20 (solvent 1). Which of the following extraction methods will remove the largest amount of the organic solid from the aqueous solution? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. Three 50 ml portion extractions with ether (solvent 2) a b C d Two 50 ml portion extractions with ether (solvent 2) One 150 ml portion extractions with ether (solvent 2). One 50 ml portion extractions with ether (solvent 2) Unanswered Submit Fullse

5. Each mixture below contains 1 mL solvent 1, 1 mL of solvent 2, and 40 mg of the solid. For each, indicate the species contained in each layer using the sketched test tube. Solvent 1 CH,CH,-O-CH,CH, H₂O Solvent 2 CH,CH,-O-CH,CH, H₂O CH₂Cl₂ CH₂Cl₂ H₂O IM HCI (aq) H₂C-N Solid NaCl CH3 H₂C HQ NH₂ Test tube D

Question 5

Will a red blood cell undergo crenation, lysis, or no change in each of the following solutions

Will the melting point increase or decrease with the benzoic acid, 4-chloroanaline, and naphthalene if : -You do not remove all of the HCl from the first extraction (mixture) -You forget to do the NaOH extraction (aq layer) -You do not rotovap all of the solvent in the final step (organic layer)

In which of the following cases would recrystallization be favored over extraction when purifying a mixture of two solid compounds? I. When a significant difference in pKa exists between the two compounds. II. When both compounds have the same functional group(s). III. When the desired compound is poorly soluble in the solvent pair at low temperatures and greatly soluble in the solvent pair at high temperatures. A. I and III B. II C. II and III D. I and II E. I, II, and III F. None of the above

13-CH2-O+ nA- WATER SOLUB X bapps/assessment/review/review.jsp?attempt_id= 4910689_1&course_id=_69748_1&content_id= 3071. IVE Round your answer to the second decimal place. Selected Answer: 8.26 estion 8 In an aqueous solution at 25 °C, when the [OH"] > [H3O*] which ONE of the following is true? Selected Answer. The pH is less than 7 and the solution is acidic. Answers! The pH is greater than 7 and the solution is basic. The pH is greater than 7 and the solution is acidic. The pH is less than 7 and the solution is acidic. The pH is less than 7 and the solution is basic. Question 9 in a 11 ratio during a neutralization reaction?