1- To purify the mobile phase gas in GC we commonly use: a) IEC b) adsorption c) partition d) traps 1 2- In capillary columns the stationary phase is: (a) packed in the capillary. (c) gradient liquid. (b) coated inside the capillary. (d) isocratic liquid
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- Construct the phase diagram for for gold and thallium. Pure gold melts at 1063°C and pure thallium melt at 302°C, respectively and a eutectic composition between 20 and 30 wt-% Au is found with a melting point of 128°C. (a) Identify the eutectic composition (b) For each region, identify the number of phases and the solid that separates out, if any. (c) Find the composition(s) at ZA = 60 wt-% Au at 400°C! (d) What is the ratio of amounts in the phases for the point in (c)? - (e) For a composition(s) of ZA 20 wt-% Au, heat the sample from the 0°C to 400°C; for each phase transition describe the number of phases, composition of each phase and relative amounts at the start and end point, before and after the phase transition. Composition, wt-% Au 10 20 30 40 60 80 90 Melting T (°C) 272 204 200 400 686 910 998(1) Calculate the amount of lime and soda required for softening 9000 litres of water sample containing in ppm, Mg(HCo = 50; CaCl, = 111; MgSO, = 120; CaSO, = 138; NaCi = 480 and Fe-O, = 234, The lime of 80% and soda of 90% purity was utilized in the process. (i) You are given a task to treat the hard water to produce clear, transparent, and softened water (the residual hardness up to 20 ppm is allowed). As a responsible engineer of the plant, what is your strategy to generate the water of required softness? ExplainQUESTION 6 Which of the satements below is/are limitations of Dumas Method? i. The Ideal condition is just an assumption for the vapor of the volatile sample ii. The sample must be a volatile liquid with a boiling point above 25°C and below 100°C using similar method iii. Possibility of having Impurities may not cause discrepancies of the result only i and ii are the limitations O All are Method's limitation O only i is the limitation O only ii and iii are the limitations
- 5. In preparation for the analyses of other types of samples that may reach your laboratory, the supervisor tasked you to research different extraction procedures for the analyses of Tetrahydrocannabinol (THC) and other related compounds so that you can purchase different extraction instruments. How will you convince him to buy a Supercritical Fluid Extraction Instrument? CIn gravimetric analysis, volatile electrolyte is used in peptization step a. to form small nucleib. to easily dry precipitatec. to reprecipitate the analyteexplain pleaseConsider a mixture of the compounds shown below dissolved in hexane (C,H14). CH3(CH2)10CH3 CH;COOH CH,CH2CH2OH CH3COCH,CH3 IV The mixture is separated using the TLC technique. The solvent used as mobile phase is benzene (a non polar solvent) and the plate used as stationary phase consists of a coat of silica (SiO»). Which compound will move faster? O II O IV
- (a) In High Performance Liquid Chromatography (HPLC), the separation method is by partition of the solute (analyte) between the mobile phase and the stationary phase. Explain how this leads to separation of analyte mixtures; (b) Describe the structure and materials use in a typical column used for HPLC. Thereby explain why high pressures have to be used in HPLC; (c) Discuss how the need for high pressures also imposes requirements on the injector;Name the active depigmentation ingredients in the following Facial Lotion, (PEG 8-propylene glycol; 2-ethyl-hexyl salicylate; thioglycine;Hydroquinone;NaHSO,/Na,SO;; Al-citrate; Ethanol, Water) 1. 2 3 .. *....POin Elevation Aselution in preparnd by dissolving 15.60gof ordinary ger (sueroe, CHO, molecular weight-342 amu) in 15.00 gof water Calculante the boiling peier of the solution Sacose i anovolatile nonelectrolyte Solvent TC) THC) rCkg/mal) rChg/moll Benzene, Cal 80.1 253 55 530 Camphor, Cato 204 176 37.7 Cyciohexane, CH B0.88 2.79 6.50 202 Nitrobenzene, Cll, NO, 2108 524 81 water, H0 100.0 0.00 Submit Sho A h E Try A
- Boiling point of lodine (12) must be higher than that of Bromine (Br2) because For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS 1=vEvA<2I%0白Q Paragraph Arial 14pxIn column chromatography, the following statements are true except-* The stationary phase is held in a narrow tube through which the mobile phase is forced under pressure The effectiveness of the chromatographic column in separating two solutes depends in part on the relative rates at which the two species are eluted The stationary phase is supported in a flat plate or in interstices where the mobile phase moves through by capillary action or under the influence of gravity Predict the order of elution of the following components if a normal phase column and hexane:methylene chloride mobile phase was used in the separation. (A.) Propanone (B.) Propanoic acid (C.) Methyl ethanoate BCA ABC ACB The following are true for the observed tailings and fronting in a chromatogram, except- Fronting and tailing leads to a good separation and reproducible elution times Tailing is observed when the tail appears to the right of the chromatogram and front is steepened while fronting is observed when…Study the tabulated data during an gravimetric analysis of BaSO4 experiment Trial T1 T2 T3 Mass of sample (g) 1.0040 1.0100 1.0050 Constant weight of empty crucible (g) 10.2453 10.2454 10.2454 Constant weight after ignition (g) 10.3253 10.3252 10.3253 1. Calculate the mean mass of precipitate as BaSO4 a. 0.0799 g b. 0.0800 c. 0.08 g 2. Calculate the mean weight of sulphate (MM BaSO4 = 233.39 g/mol, So42- = 176 g/mol)? a. 0.0603 g b. 0.06 g c. 0.06025 g 3. Calculate the mean % SO42- in the sample a. 6.00% b. 5.991% c. 5.9908%