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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- Determination of the impurity of peroxide compounds in medical ether is carried out using a reagent: A) Potassium permanganate in sulfuric acid B) Sodium nitrite in an acid medium C) Potassium iodide D) Potassium periodateWe want to extract terpenoids from an aqueous sample by continuous liquid-liquid extraction. Which of the following solvents is not suitable for this purpose? Why? Propanone (acetone), dichloromethane, heptane.Why was n-octanol chosen as a surrogate for natural organic phases? Why notanother solvent such as n-hexane, methylbenzene, trichloromethane, or diethylether?Why is the use of any organic solvent as general surrogate of a natural organicphase somewhat questionable?
- What solvent below would be able to be used in a liquid-liquid extraction where hexane (CH3CH2CH2CH2CH2CH3) was used as the organic solvent?Why is the 4-methoxyphenyl acetate organic layer subjected to washes with saturated sodium bicarbonate solution, water and brine when carrying out a separatory funnel extraction?At normal temperature, 5-bromoacetylsalicylic acid melts at 60 °C and is inert and nearly insoluble in water. Why is it that water cannot be utilized as a recrystallizing solvent for this compound?
- 1. Which of the following may cause an increase in the calculated percent recovery of the recrystallized benzoic acid? a.Adding too much solvent in the receiving flask during hot filtrationb.Using cold water in rinsing the residue from the flask during hot filtration c.Using fluted filter paper during hot filtrationd.Not adding animal charcoal to the solution2. Which set of reagents can confirm that sulfate ions are present in two unkown solutions? a.1.0 M NaOH and excess NH3 b.0.1 M Ba(NO3)2 and 0.01 M KMnO4 c.1.0 M NaOH and 0.1 M K2Zn3[Fe(CN)6]2d.0.1 M Ba(NO3)2 and 1.0 M CH3COOH5-bromoacetylsalicylic acid melts at 60 °C and is inert and almost insolube in water at room temperature. Why can’t water be used as recrystallizing solvent for this compound?Explain the function of using dichloromethane after the steam extraction of Eugenol. Also discuss if there are any differences and which ones in soxhlet extraction and steam drag.
- Calculate the weight of nitrobenzene that codistills (bp 99°C) with each gram of water during a steam distillation. You may need the data given.Given that Grignard reaction used 1.4555 g of phenyl bromide 10 g of carbon dioxide , 0.5734 g of magnesium fillings, and 30.2 mL of 6M HCl, but has 573 mg of benzoic acid after isolation and recrystallization. What was the percent yield for the overall process? Round to the nearest hundreth.2. Describe and explain the effect(s) on your result for the following possible experimental errors. In each case, specify the component(s) whose percentage(s) would be too high or too low and explain your rationale why these would be changed. (a) After adding DCM to the counterfeit pharmaceutical at the beginning, you didn’t stir or shake the mixture before filtering. (b) Washing the sucrose recovered during the first vacuum filtration with water rather than DCM. (c) During the NaHCO3 extraction, you failed to mix the organic and aqueous layers thoroughly. (d) You mistakenly extracted the DCM solution with 5% HCl rather than 5% NaHCO3. (e) You neutralised the NaHCO3 solution to pH7 rather than pH2.
