can be used in liquid-liquid extraction? I. water-methanol II. water-diethyl ether III. hexane-dichloromethane IV. hexane-acetone Group of answer choices II only II and III I and III II and IV
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Which of the following solvent pairs can be used in liquid-liquid extraction?
I. water-methanol
II. water-diethyl ether
III. hexane-dichloromethane
IV. hexane-acetone
- II only
- II and III
- I and III
- II and IV
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- 1%9V lli. O 1 M A;Yv 1. IF found impurity the melting point - Increase - Not effect - Decrease 2. benzoic acid can be purified by sublimation at . . pressure - high - low - normal 3. . . separates liquids with closer boiling points. * - fractional distillation - Extraction - Simple distillation with increasing 4. melting points molecular weight."The separation and purification processes given below and the method used against them are given. Which or which of these pairings are correct? I. Brewing of tea - ExtractionII. Purification of water impurities - ChromatographyIII. Separation of olive pomace from olive oil while producing olive oil-DecantationIV.Petroleum fractions obtaining - Ordinary distillationV. Obtaining essential oils and using them in perfume making - Water-steam distillationg) h) i) j) H₂C Ph OCH3 HO OCH₂Ph OSI(CH₂)3 Br PPha + 2 1) "Buli /THF / rt/1.5 h 2) OsO4/ NalO4 acetone /ether LOCH3 -Si(CH3)3 CH3 /nt/1 h CH₂Cl₂-78°C / 15 min PPn, /1₂ (1 eq) imidazoie / THE 0°C - rt
- a. Calculate the base saturation using the following given miliequivalent weights obtained from a 25g soil sample (a. Ca++= 2.23 m.e.; b. Mg++=1.32 m.e.; c. Na+= 1.98 m.e.; d. K+= 1.87 m.e.; e. H+= 1.27 m.e.; f. Al+++= 0.11 m.e.; g. NH4+= 2.3 m.e.; h. NO3-= 1.5 m.e. b. Calculate the CEC (m.e./100g soil) using the following given miliequivalent weights obtained from a 25g soil sample (a. Ca++= 2.23 m.e; b. Mg++=1.32 m.e.; c. Na+= 1.98 m.e.; d. K+= 1.87 m.e.; e. H+= 1.27 m.e.; f. Al+++= 0.11 m.e.; g. NH4+= 2.3 m.e.; h. NO3-= 1.5 m.e.Azo Dye On ထာ 2 7 TH Amine Component 2 H₂N . 1 mole NO₂ 1 mole "NH₂ Coupling Component 3 Emole 2 moles NH₂ xx xx 1 mole 2 moles :Explain the reactions involved in separation separation of benzoic acid from mixture contain 3 components 1.Benzoic acid (acidic nature pKa=4.17) 2.Naphthalene (neutral compound) 3.paraNitroaniline(basic compound pKa=12.99
- 1:4 (vv) piperidine/DMF CF,CO2H Y CH,Cl2 NH H2N. H2N H,N. NH NH2 NH3 NH2 + II II IV Consider the reaction scheme given above. What are products 'X' and 'Y'? O X = II; Y = IV O X = IV; Y = || O X = II; Y = II O X= 1; Y = IIIDENTIFICATION OF THE COMPONENTS OF THE MIXTURES. 1. A. Sodium Chloride - naphthalene -'Food Color Mixture 1. Sublimation 2. Adsorption with activated carbon 3. Dissolution with water then evaporation B. Sodium chloride - Sulfur - Sand Mixture 1. Dissolution with water then evaporation 2. Dissolution with toluene then decantation 3. Dissolution with toluene the evaporationа. ОН 1. TBSCI imidazole, CH2Cl2 A DMF, -18 °C to rt 2. NalO4, CH2Cl2 80% НО OH large excess
- Which of the followings is the important feature for choosing a good solvent for any recrystallization? O a. The compound of interest should be soluble in the solvent at high temperatures, but insoluble at room temperatures o b. c. The compound of interest should be insoluble in the solvent at high temperatures, but soluble at room temperatures O d. The compound of interest should be soluble in the solvent at all temperatures O E. The impurities must be insoluble in the solvent at high temperatureTable 1. Color Observed Color Complementary Color Structure of Dye of Solid of Dye Solution of Dye Solution Sudan IV N,N- Dimethyl-p-phenylazoaniline N,N-Dimethylindoaniline 4-0-tolyazo-o-toluidine veleng mex) by your dye. 6.626x 10 J s a s t) ad c (speed ligh 景Table 1: Selected phytocomponents identified in the plant extract. Retention time, min Name of Compound 10.767 Benzaldehyde 15.790 Azulene 16.002 1-Piperazinecarboxaldehyde 17.935 Phthalan 20.731 2-methoxy-1,3,4-trimethybenzene 24.028 Methylesterpentanoic acid 26.993 Tetradecamethylcycloheptasiloxane 31.753 Hexadecamethyl Cyclooctasiloxane If GC is combined with MS, what data you will add as the 3rd column in Table 1 above. Fill in that data for each of the select identified phytocomponents.