Draw the right structures of the compounds in each step of an extraction experiment. NH2 он H,C dissolve in ether extract with HCI, separate layers aqueous layer ether layer extract with NaHCO3 separate layers ether add K2CO3 filter aqueous layer evaporate add HCI, filter
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A: The organic compounds present in the mixture are benzocaine, phenol, biphenyl and benzoic acid.
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- directly analyse a solid sample with AAS, which method will you prefer? Explain this.Explain how solid-phase microextraction works. Why is cold trapping necessary during injection with this technique? Is all the analyte in an unknown extracted into the fiber in solid-phase microextraction?A newly synthesized drug was found to have a carboxyl group, an imide and a sulfonamide group. The first type of method to consider in this drug molecule’s quantitatve analysis is: a. Non-aqueous Alkalimetryb. Non-aqueous Acidimetryc. Aqueous Alklaimetryd. Aqueous Acidimetry
- Two compounds A and B from GC on two open tubular columns contains a XY-1 (100% methyl) and a XY-2 (50% methyl, 50% phenyl), with the same diameter, thickness and length under the same experimental conditions. The retention times and peak widths are show in the Table 1.Hint: phenyl groups interact more strongly with polar groups than methyl groups. Which compound is more polar? Explain your answerWith the methods and GC columns used in organic labs, the volatility of the nitrotoluene products is the factor that is most responsible for the separation of the products in the GC. Predict the order of the nitrotoluene retention times expected in your chromatogram. Order from lowest (top) to highest (bottom) retention time. Para-Nitrotolulene, Meta-Nitrotolulene, Ortho-Nitrotolulenepercentage recovery of benzoic acid is 77.18%. The melting point range of crude benzoic acid = 112-119°C and the melting point range of pure benzoic acid (crystals) = 122-125. Comment on the percentage recovery of benzoic acid. Comment and compare the melting point of the crude and crystal samples
- Doe hydrophobic silica gel act as non-polar stationary phase in TLC making the process as reverse chromatography? explainExplain ONE of the micro-extraction techniques based on the solid-phase. Your explanation should include:a) The principle and steps of extraction of the selected techniqueb) The advantages and disadvantages of the selected technique compared to conventional techniquesc) The potential applications of the selected techniqued) The new advancement/modifications that can be performed to improvise the selected techniqueHow would you make 150ml of Coomassie Staining Solution
- In HPLC, why is purging or initialization being done before analysis of samples, explain.Which two of compounds below will be difficult to be separated by column chromatography (using ethanol as solvent) and why? -p-anisic acid -methyl-4-aminobenzoate -benzoic acid -ethyl-3-hydroxybenzoate -ethyl-4-nitrobenzoate -trans-cinnamic acid -benzanilide -2-methyl-1-nitronapthalene -9-fluorenone -naphthalene -trans-stilbene -vanillinA mixture of biphenyl, benzyl alcohol, and benzoic acid is spotted on a silica gel TLC plate and developed using Ethyl Acetate with 0.5% acetic acid as the solvent. Predict the relative Rf (highest to lowest).