QUESTION 22Which of the following is not a requirement for a recrystallization solvent?O a low boiling point to facilitate removalO the desired compound is insoluble at all temperaturesO impurities are soluble at ali temperaturesO bailing point is lowet than the melting point of desired solidO does not react chemically with the desired solidQUESTION 23Raschig rings were added to theO 1. West condenser prevent the liquid from bumpingin fractional distillation in order toO 2, Claisen adapter, increase the rate at which the vapors entered the cendenserO1 Hempel column, increase the number of theoretical platesO 4. West condenser, increase the surface area inside the condenserOS: None of the above

The desired compound is insoluble only at room temperature and of the temperature raises it…

QUESTION 22 Which of the following is not a requirement for a recrystalization solvent? O a low boling point to facilitate removal O the desired compound is insoluble at al temperatures O impurities are soluble at ali temperatures O beiling point is lower than the meting point of desired solid O does not react chemically with the desired solid

QUESTION 22 Which of the following is not a requirement for a recrystalization solvent? O a low boling point to facilitate removal O the desired compound is insoluble at al temperatures O impurities are soluble at ali temperatures O beiling point is lower than the meting point of desired solid O does not react chemically with the desired solid

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter9: Liquids, Solids, And Materials

Section: Chapter Questions

Problem 103QRT

See similar textbooks

Similar questions

a concentrated H2SO4 has the following composition specific gravity 1.84 and purity of H2SO4 is 97 percent by weight. express in mole/L
When recrystalizing an aspirin sample the hot solution cooled to room temperature and no crystals appeared, so the flask was placed in Ice water. A large amount of solid appeared however the product was contaminated with impurities. explain.
Given the following mixture of two compounds 30.00 g of X (liquid) (MW =58.00 g/mol)(density 1.088 g/mL) and 880.00 g of Y (50.00 g/mol))(density 0.808 g/mL), calculate the mass percent of X. Given the following mixture of two compounds 35.00 mL of X (MW =80.00 g/mol)(density 0.945 g/mL) and 735.00 mL of Y (80.00 g/mol))(density 0.810 g/mL). The vapor pressure of pure Y is 47.00 torr. Calculate the vapor pressure of the solution.
When performing a recrystallization of an impure solid, why is it important to allow the heated solution to cool slowly? Group of answer choices For the molecules of the pure solid to arrange in organized crystal lattices. To encourage solubility. To avoid the need for ice. To trap particles in the crystal lattice.
The presence of soluble impurities in a given substance A lowers the melting point of A because the vapor pressure of pure liquid A is decreased. Group of answer choices True False
TRUE OR FALSE: 1. Solids such as naphthalene when heated will pass thru a process called condensation prior to sublimation when being purified. 2.If water and n-propyl alcohol were mixed, the separation of individual components is possible with steam distillation because these two have a wide range of boiling point difference. 3. When an impurity in the synthesized camphor such as sodium chloride is present, the sublimation technique cannot be used to purify the camphor due to the nature of NaCl. 4. Organic solvents such as hexane or ether are an excellent medium to recrystallize an impure benzoic acid 5. In caffeine extraction, it is important that the tannic acid component of coffee be converted to its free acid state to avoid any interference with the extraction of caffeine
When performing a recrystallization of an impure solid, why is it important to allow the heated solution to cool slowly? Group of answer choices To encourage greater solid solubility. For the molecules of the solid being purified to arrange in organized crystal lattices. To avoid the need for using ice to cool the solution. To trap particles in the crystal lattice.
2. Which of the following statements is NOT true regarding the surface of a solid?a. The atoms have the same bonding and arrangement as in the bulk crystalb. It becomes more important in determining properties as particles get smallerc. The surfaces differ based on how they are formed (i.e. how the crystal is cut)d. It has long range order 3. What is false about the eutectic point of a solution composed of two liquids?a. The eutectic point indicates the freezing temperature of any solution composition resulting from mixing the two liquidsb. At the eutectic point, the chemical potential of the solution is equal to that of both solidsc. The eutectic point represents a phase transition from the solution to solidd. The eutectic point is always at a lower temperature than the freezing point of either of the pure liquids 4. Liquids primarily differ from gases and solids in that?a. They always have a higher density than gases and a lower density than solidsb. They have higher potential energy…
In which option is the order showing whether the questions given below are true or false? ( ) Airborne humectants are generally called hygroscopic substances. ( ) Removing water from solids can be done by heating your sample in the oven just below its melting point. ( ) Drying capacity is a measure of the drying efficiency of the dryer. ( ) Drying intensity is the amount of water held by 100 grams of dryer. ( ) For the phenomenon called "blooming" to occur, the vapor pressure of the hydrate system must be higher than the partial pressure of water in the air. A. Right, Wrong, Right, Wrong, RightB.Right, Right, Wrong, Wrong, RightC.Right, Wrong, Wrong, Wrong, RightD. Right, Wrong, Wrong, Right, RightE.Right, Right, Wrong, Wrong, Right
Consider the following scenario: a small amount of a solid got into a sample when preparing the capillary tube to determine its melting point. The student decided to take the melting point anyway. The student observes the following: (a) a sharp melting point (<2oC); (b) a melting point that closely matches the literature reported value. Which of the following conclusions will not be justified by the experimental results. The solid was a soluble impurity in the liquid phase. The solid was an insoluble impurity in the liquid phase. The solid was a sample of the same compound.
………… is usually used only to separate liquids whose boiling points differ greatly or to separate liquids from involatile solids or oils. which option is correct?a. distillation b. simple distillation c. fractional distillationd. steam distillation e. vacuum distillation
3.1 Calculate the volume of concentrated (98% v.v) H2SO4 that you will need to prepare 250ml of an 5.4 M H2SO4 solution. Density of 98% v.v H2SO4 = 1.84 g/cm3