All the following are correct according to solvent pair, except: Used when substance is too soluble in one solvent and insoluble in another Help in the step of selection of solvent First begin with the substance soluble in solvent then the less soluble Must be completely immiscible
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- Although other solvents are available, dichloromethane(CH₂Cl₂) is still often used to “decaffeinate” drinks because thesolubility of caffeine in CH₂Cl₂ is 8.35 times that in water.(a) A 100.0-mL sample of cola containing 10.0 mg of caffeine is extracted with 60.0 mL of CH₂Cl₂. What mass of caffeine re-mains in the aqueous phase? (b) A second identical cola sampleis extracted with two successive 30.0-mL portions of CH₂Cl₂.What mass of caffeine remains in the aqueous phase after each extraction? (c) Which approach extracts more caffeine?The following evidence was obtained from an experiment to determine the solubility of calcium chloride at room temperature. A sample of saturated calcium chloride solution was evaporated to dryness, and the mass of solid residue was measured.EvidenceVolume of solution (mL) = 15.0Mass of empty beaker (g) = 90.54Mass of beaker and residue (g) = 101.36The solubility of calcium chloride is g/100 mLYou are given a substance that is qually soluble in water and hexane (two immisible solvents) a) what is Kd B) if you start with 10g of the substance dissolved in 100ml of water and are given 100ml of hexane to extract with, algebriaically show that it is better to do two smaller extractions using 50 ml of hexane for each extraction than it is to do one extraction using 100ml of hexane
- Cyclonite, also known as RDX (Research Department Explosive), is used to make Semtex, a plastic explosive, when mixed with PETN. Semtex was used in the bomb that brought down PanAm flight 103 over Lockerbie, Scotland in 1988 killing 270 people. RDX is typically recrystallized from acetone. 1 gram of RDX is soluble in 100 mL of cold acetone (0 0C) and in 25.0 mL of boiling acetone. A student performed recrystallization starting with using 5.0 mL of acetone. a. What is the maximum amount of crude RDX the student can purify given this volume of acetone in order to maximize the % recovery? b. A student reported 65% recovery from the process of recrystallization after using 5.0 mL of acetone and the mass that can be used with that volume (part a). Is 65% the maximum % recovery of RDX using the volume you calculated in part a? Show your work.4.0g of potassium hydrogen tartrate was added to 300mL distilled water. The temperature of the solution is 23.1C. The liquid was filtered and 50mL of the filtered solution was transferred to 250mL beaker, two drops of phenolpthalein was added to the 250mL beaker. The concentration of NaOH is 1.0 M that is filled in the 2mL graduate pipette, single drops of NaOH was added to the 250mL beaker until the solution turns pink and the potassium hydrogen tartrate reach the endpoint. The datd of four trials was collected. Please answer the following questions 4) calculate ksp for potassium hydrogen tartrate for each trial and average ksp for thr experiment 5) calculate the percent error in you value of ksp using reference that is found as the theoretical value. 6) why was the temperature of the saturated solution recorded?4.0g of potassium hydrogen tartrate was added to 300mL distilled water. The temperature of the solution is 23.1C. The liquid was filtered and 50mL of the filtered solution was transferred to 250mL beaker, two drops of phenolpthalein was added to the 250mL beaker. The concentration of NaOH is 1.0 M that is filled in the 2mL graduate pipette, single drops of NaOH was added to the 250mL beaker until the solution turns pink and the potassium hydrogen tartrate reach the endpoint. The datd of four trials was collected. Please answer the following questions 1) calculate the total volume and moles of NaOH required to reach the endpoint for each trial. 2) calculate the molar solubility of potassium hydrogen tartate ( in mol/L) for each trial. 3) calculate the average molar solubility of potassium hydrogen tartate for the four trials. What is the average solubility of potassium hydrogen tartrate in g/L? 4) calculate ksp for potassium hydrogen tartrate for each trial and average ksp for thr…
- Use the information in the pictures if needed and solve for the unknown D. please type the answers because it is much easier for me to understand that way. Unknown D To the unknown mixture, 3 drops of 6 M HCl was added and no precipitate formed. To the liquid that was left, 3 drops of 0.10M (NH4)2SO4 was added and a precipitate formed. The precipitate was isolated by centrifuging and the liquid from the top decanted for further testing. To the decanted liquid, the solution was made basic and a few drops of (NH4)2C2O4 was added. No precipitate formed. The liquid was tested for Mg2+ and a bright blue jelly ppt formed. To the unknown, a separate NH4+ test was done and the litmus paper used to test the pH turned blue. To the unknown, a flame test was performed and the color emitted was a light purple-red. What ions are in the unknown? (Identify unknown ions and provide a brief summary) DO NOT SIMPLY RESTATE THE ABOVE OBSERVATIONS.a) With reference to the molecules below, explain the factors which govern the watersolubility and melting points and explain the differences in the values observedbelow.b) You are a chemical engineer working in a pharmaceutical manufacturing plant.You’ve been tasked with scaling up the synthesis of a potential drug candidate.From previous studies, you know the following information about reaction takingplace:ΔHoreaction = -112.2kJΔS = -15.26JK-1mol-1ΔG = -18.81kJ Discuss the meaning of each term/value and what this tells you aboutthe nature of the reaction. Given the above information, briefly state the impact of low/hightemperatures on the above reaction.Q1. Dissolved 0.273 grams of pure sodium oxalate (Na2C0.) In distilled water and added sulfuric acid and titration the solution at 70 ° C by using 42.68 ml of KMnO, solution and has exceeded end point limits by using 1.46 ml of oxalic acid (H , C, 0.) With 0.1024 N. Calculate the normlity of KMnO .. Note that the molecular weight of sodium oxalate (Na, C, 0.) = 134 and its equivalent weight = 67
- Hexanoic acid was added to an immiscible biphasic solvent system, water and CCl4 at 20.0OC and the equilibrium concentrations of hexanoic acid were determined to be 3.66 g/L in H2O and 67.0 g/L in CCl4. Caluclate the distrubution coeffiecent (D2) of hexanoic acid in water with respect to CCl4.50.0 mL of 1.0 M HCl (at 22.0ºC) and 50.0 mL of 1.5 M NaOH (at 22.0ºC) are mixed. The solution temperature rises to 28.9ºC. What is ΔHrxn for the reaction?At a certain temperature, the solubility of zinc(I) chromate is (7.6x10^-5) M. What is the Ksp? Report your answer to 2 sig figs. Note: Your answer is assumed to be reduced to the highest power possible