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- These are characteristics of solvent used for recrystallization except: should react with the substance to be dissolved should dissolve an appreciable amount of the substance to be purified when hot and should crystallize most of the substance when cold should be capable of easy removal from the filtered crystals and therefore its boiling point should be preferably w/in 60 - 100 OC could yield well formed crystals of the desired substancePOin 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 Ashort, 1-minute survey. DISMISS 5. In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid that boils below 100°C is vaporized in a boiling water bath and the mass of the vapor required to fill the flask is determined. The following data was collected: 4oFlask Volume 100.0 + 100.0 + 79.6 mL = 279.6 mL Mass of Flask + Cap Mass of Flask + Condensed Liquid Mass of Condensed Liquid Temperature of Water Bath (°C) Barometric Pressure (atm) 143.85 g 144.95 g 1.10 g 84.1 °C 0.985 atm a. What is the molar mass of the unknown? b. What will its temperature be when the pressure is 1.20 atm and the volume is 250.0 mL?
- 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 998Volatile and semi-volatile compounds can be analyzed by GCName 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 .. *....
- Q3 Draw the phase diagram for metals (A. B) with melting points (1180°C, 1455°C respectively). They are completely soluble in cach other in solid stale. Follow up the cooling of alloy with 60% B: 1- Find the melting range of alloy with 20%A (start of solidification, end of solidification). 2- 2- Find the Percent, chemicals composition of liquid and solid at 1300°C for alloy with 60%B 3- Draw the microstructure for alloy 30% B at room temperature.chools.schoology.com/common-assessment-delivery/start/4573067641?action%3Donresume&submissionld%3547892539 150 140 130 120 110 100 NANO 90 80 70 60 NH C Ka Náci 50 40 30 20 KCIÓ, 10 Cez(so 10 20 30 40 50 60 70 80 90 100 Temperature (C) The compound with the least solubility at 50 °C is OKI O NANO3 O KNO3 O NH3 O NH&CI O KCI O NaCI O KCIO3 O Cex(SOa)a DELL & Grams of soluteThe following solvent selection data were collected for an impure sample of solid compound, unknown X (mp = 70 C) Solvent Solubility at RT Solubility at BP Crystals upon Cooling Hexanes (bp = 68°C) Insoluble Soluble Many Chloroform (bp = 61°C) Soluble Soluble Very few Ethyl Acetate (bp = 77°C) Insoluble Insoluble Propanol (bp = 97°C) Insoluble Insoluble Ethanol (bp = 78°C) Insoluble Soluble Many %3D Water (bp = 100°C) Insoluble Soluble Very few %3D Based on these results, what solvent would you choose for your recrystallization? Explain your answer.
- Q3/ Caleulate the solubility parameter for amorphous polylactie acid, which has a density of 1.21g/cm3. Also, identify the best solvent for molecular weight determination. Explain your reasoning. Note that the density for acetone, ethyl acetate, and tetrahydrofuran are 0.791,0.902, and 0.889 g/cm3, repsectivily. Note H-1 g/mole, C-12 g/mole, N-14 g/mole, and 0-16 g/mole. CH3 -H polylactic acid (C3H402)n но Aceton:C3H60 ethyl acetate :C4H8O2 tetrahydrofuran :C4H80 人人 Group Molar Attraction Constant Fin (MPa) cm' mol -CH, 420 --CH, - 280 >CH- 140 >C< 0. P-phenylene 1377 -0- 256 -CO- 685 -COO 512> EL session.masteringchemistry.com MasteringChemistry ROSTER-2019-SPRI-PULLM-CHEM-101 blackboard wsu Google Search MasteringChemistry: HW 8 KHW 8 Applications for Dilution Calculations K8 of8 Dilution as a procedure in analysis We sometimes purposely dilute solutions if the analyte concentrations wavelengths in the visible (and sometimes uitraviolet) range. Based on the dissolved solute's properties, we can quantify that solute's concentration are too high to permit an accurate measurement. For example, a spectrophotometer can measure the amount of light that passes through a sample solution for If the solute's concentration is too high, a relatively small amount of incident light having the wavelength that corresponds to the solute's absorption behavior will less light is absorbed, and the detector in the spectrophotometer can generate more reliable data. reach the dete ctor, which results in an inaccurate measurement (consider the result if you blocked the light with an opaque…8. Which is the correct order for a recrystallization procedure?a. solvent selection-dissolving-deposition and collection of crystals-filtration-washing-dryingb. solvent selection-dissolving-filtration-deposition and collection of crystals-washing-dryingc. solvent selection-dissolving-deposition and collection of crystals-washing-filtration-dryingd. solvent selection-dissolving-filtration-washing-deposition and collection of crystals-dryinge. solvent selection-filtration-dissolving-deposition and collection of crystals-washing-drying