1. Explain the problem with each of the following techniques. The sodium hydroxide solution was not mixed thoroughly after diluting with deionized water. A student fails to swirl the Erlenmeyer flask during the addition of NaOH solution during the titration.
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1. Explain the problem with each of the following techniques.
- The sodium hydroxide solution was not mixed thoroughly after diluting with deionized water.
- A student fails to swirl the Erlenmeyer flask during the addition of NaOH solution during the titration.
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- Describe why the inside wall of the flask is rinsed with deionized water during accurate titration. Does this washing affect the molar quantity of acetic acid in the sample? Describe..?1. Why are the acidic extracts and the basic extracts cooled before neutralization during Acid/Base extraction experiment? 2. Why was the water used for washing the precipitates on the funnels specified to be cold during Acid/Base extraction experiment.Why is the titration done with vigorous swirling?
- the eugenol and water distillate you collect is apt to be cloudy, particularly the first part of this distillate. Explain why.During the reaction of 1-bromobutane with sodium ethoxide, a white precipitate form. This precipitate disappears during the initial quench (addn of water) of the work-up procedure. What is it? Where did it go?Purification of benzoic acid 1. What is the purpose of washing the crystal in the filter paper with water? 2. How recrystallization affects the theoretical yield of sample? Explain.
- Which is the best solvent to recrystallize the following compound?Separating t-butyl chloride from the reaction mixture. What is the purpose of washing with the following? . a. With cold water b. With sodium bicarbonate solution1)Write the principle behind reflux technique. 2)The role of recrystallization of dibenzalacetone
- Melting point range Recrystallized Phenacetin 95-100 Recrystallized Phenacetin + Reference Phenacetin 110-115 Recrystallized Benzil 92-95 Recrystallized Benzil + Reference Benzil 94-98 Questions: 1. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of mixed melting point. 2. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of melting point. 3. What are two characteristics of a good recrystallization solvent for a given compound? 4. Given a solid sample that contains impurities, how would you determine which solvent to use for a recrystallization? Describe how you would do this in the laboratory. 5. Clearly explain the difference between a recrystallization and a precipitation.After a crude product is dissolved in 1.5 mL of hot solvent, the resulting solution is dark brown. Because the pure compound is reported in the literature to be colorless, it is necessary to perform a decolorizing procedure. Should you use pelletized Norit or powdered activated charcoal to decolorize the solution? Explain your answer.Kiko, 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 cyclopentanol