Why is there a need to add concentrated H2SO4 to the centrifugate and evaporating almost to dryness before the addition of methyl alcohol in confirming the presence of BO3-3?
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Why is there a need to add concentrated H2SO4 to the centrifugate and evaporating almost to dryness before the addition of methyl alcohol in confirming the presence of BO3-3?
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- 5. Give the definition of the inductive effect. What is the reason for its appearance in the molecule? Show the effect of the inductive effect in molecules: bromoethane CH3CH3B1; ethanol CH3CH2OH; fluoroethane CH3CH2F.When you are extracting an aqueous solution with an organic solvent, you are uncertain of which layer in the separatory funnel is aqueous, how would you quickly sort out the issue.Heptanet-4-hione LA predicted solubility (with a reason) in the following representative solvents/solvent systems H20, Dilute HCI, Dilute NazCO3, Dilute NaOH, ELOH; acetone; CHCIB; Hexane.
- You were given a mixture of two miscible solvent A and B that you are tasked to separate. You know that solvent A has a boiling point of 49 oC while solvent B has a boiling point of 174 oC. Which of the listed method would overall be the most efficient? Fractional distillation Recrystallization Solid-liquid extraction Liquid-liquid extraction Simple distillation Acid-Base extraction(DV 20 ml. of an aqueous solution of 2 mmol butyric acid is shaken with 10 mL ether. After the layers are separated, it was found that 0.5 mmol of butyric acid remains in the aqueous layer. Calculate "D" and "%E".(a) What is the molarity of the NaOH? (b) Based on the propagation-of-error formula, what is the standard devlation of the molarity?
- 4. (4a) + NaHCO, - H2O + (4b)_ 5. CH;COOH + CH;CH2OCOCH3 + H2O -COCH3 6. (6a) (6b) - + H2OWhat is the dominant intermolecular force that governs the solubility of 9-fluorenone in methylene chloride?3. To determine ethanol content in beer using Gas Chromatography (GC) - Flame Ionization Detection (FID), which of the following is the suitable internal standard? (A) Acetone (B) n-propanol (C) Propane (D) Water
- 1. Describe the preparation of 500mL of 0.500M KMNO4 from the solid reagent. 2.Describe the preparation of 500mL of 4.75% (W/V) aqueous ethanol (C2H5OH, 46.1g/mol).Describe the difference between protic and aprotic solvents. Provide an example of each to support your answer.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)