1.What is the significance when KD is either a small or large value? 2. Methyl alcohol and ethyl alcohol are poor extraction solvents. Why? 3. What is the major disadvantage of using ether as an extracting solvent?
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1.What is the significance when KD is either a small or large value?
2. Methyl alcohol and ethyl alcohol are poor extraction solvents. Why?
3. What is the major disadvantage of using ether as an extracting solvent?
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- 1. What type of reaction explains solubility of phenol in sodium hydroxide? Explain the organic product formed. 2. How do the reactions of phenol samples with FeCl3 compare? Which structural component of the phenols account for the observationKiko, a Chem 31.1 student, accidentally shuffled two test tubes with different compounds on his way to the laboratory. To confirm the possible identities of the compounds, Kiko added neutral KMnO4 and Lucas reagents to both test tubes labeled A and B. Test tube A gave a brown precipitate in neutral KMnO4 while test tube B produced a purple solution in the same test. Upon subjecting to Lucas Test, both test tubes produced layers. Which of the following are the possible identities of the compounds A and B? a. Sec-butanol and 3-methyl-3-pentanol b. n-propanol and tert-butanol c. isopropyl alcohol and 4-nitrophenol d. hexanol and cyclopentanolA 0.100 gram sample of phthalic acid was dissolved in 100 mL of water. When 25 of diethyl ether was used to extract the phthalic acid, 0.042 grams of phthalic acid re recovered. What is the distribution coefficient for this extraction Kp?
- What is the purpose of adding sodium carbonate in the mixture of water and water- soluble components obtained from the solid-liquid extraction step of isolation of alkaloids from tea leaves? A.Increases the solubility of alkaloids in water thus ensuring maximum yield B.deprotonates tannins so that they will remain in the aqueous layer during liquid-liquid extraction C.'hydrolyses cellulose thus separating it along with other water-soluble components D.protonates the alkaloid to make the solution acidicWhy are hexane, cyclohexane, and toluene soluble in ligroin?What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & III
- 1.1) What is the importance and uses of pure cobalt(II) sulphate? 1.2) Name the synthesis methods of cobalt(II) sulphate (CoSO4.7H2O). 1.3) Name the purification methods of cobalt(II) sulphate (CoSO4.7H2O).2.1) Propose synthesis methods for cobalt(II) sulphate (CoSO4.7H2O). 2.2) Propose purification methods for cobalt(II) sulphate (CoSO4.7H2O).An organic chemistry laboratory Extraction; the extraction of crude naphtalene- benzoic acid mixture. Naphthalene is a suspect carcinogen and is toxic to aquatic life. Find an alternative pair of molecules that adhere better to the principles of green chemistry and can be separated by extraction using green' solvents. (kindly answer fully)Among the three solvents used in the separation of spinach pigments which produced the most effective separation? Explain your choice
- Is it possible to prepare a 17% dye solution from a 4% dye solution? Explain.What is the purpose of performing a blank titration in the assay of ibuprofen? A. To determine the amount of titrant that would react with the indictor. B. To determine the amount of titrant that would react with ibuprofen. C. To determine the amount of titrant that would react with potassium hydrogen phthalate. D. To determine the amount of titrant that would react with free acid in the solvent.Even though you used different amounts of NaSCN for each test mixture the values of Kc you measured for each should be similar. Explain why you obtained a similar value of Kc even though each mixture had a different [SCN- ]init. Hint: consider the [Fe3+ ]eq and [FeSCN2+]eq in each mixture.