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- 15 g of unknown organic sample was dissolve in 575 mL of Dicloromethane (DCM). The boiling point of benzene was increased by 3.40oC. Determine the molecular weight of the unknown sample? Kb of DCM = 2.42oC/m Bb of benzene = 39.6 oC density of benzene = 1.33 g/mL at 25 °C1. Why is there a need to correct conductivity of the sample solution?2. Cite three possible sources of error in the experiment and discuss their effects on the computed ionization constant of the acetic acid. (See details below----- literature value- Ki, acetic acid= 1.75 x 10^-5). 3. What is the effect of dilution on the fraction of the acetic acid ionized?You were given a mixture of two miscible solvent A and B that you are tasked to separate. You know that solvent A has a boiling point of 49 oC while solvent B has a boiling point of 174 oC. Which of the listed method would overall be the most efficient? Fractional distillation Recrystallization Solid-liquid extraction Liquid-liquid extraction Simple distillation Acid-Base extraction
- A student was asked to identify the best recrystallization solvent for compound X. Below is the experimental data obtained. Which is the best solvent of choice? Observations: vs= very soluble; so=soluble; ss= slightly soluble; in = insoluble Test tube 1 2 3 Solvent A B C Hot water bath vs vs ss Room temperature so ss in Ice water bath so in in Group of answer choices None B C Abottle of Na2EDTA.2H2O is labeled with an assay of 100.5%, what is this implied? What is the result of heating to 100 ºC? How does the Eriochrome Black T indicator function?Why a precipitate of manganese dioxide be removed from the potassium permaganate solution before standardization?
- Transfer 3-4 drops or a pinch of the test compound (Acetanilide) to 3 ml of the solvents, 5% NaOH and 5% NaHCO3 Shake the mixture thoroughly. The time required for the solute to dissolve in the solvent should not be more than 2 minutes. Indicate with (+) or (-) if the test compound is soluble or insoluble in the solvent. What is the theoretical solubility of Acetanilide in 5% NaOH? _______ What is the theoretical solubility of Acetanilide in 5% NaHCO3? _______You have a MASTER STOCK solution containing 1.000g of caffeine in 100mL of mobile phase solvent mixture (20% methanol / 80% water with a formic acid sodium formate buffer @ pH 3.4) You have a diluted STUDENT STOCK solution that contains 0.01g of caffeine in 100mL of mobile phase solvent mixture. You are asked to prepare 3 diluted concentrations: 1. 15 mL of student stock in 25 mL of mobile phase solvent. 2. 10 mL of student stock in 25 mL of mobile phase solvent. 3. 5 mL of student stock in 25 mL of mobile phase solvent. Calculate the concentration of caffeine (in mg/mL) for each dilution.To which sample solution the spike will be add? the distillate>130C the mass standard the distilled <130C
- Please help me find the concentration of each standard solution in the v-flask, and prepare a curve. The solution was diluted with ddH2O.1 a.How could you identify levels in the miscibility tests if you do not know densities of the solvents? b. What is the main reason for the im/miscibility of the tested solvents?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. Separating 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 distillationA. I, II, III, IVB. I, II, III, IV, VC. I, IV, VD. I, II, III, VE. I, II, V