Eren, Rochelle, and Sarah were assigned to do a recrystallization experiment using three different solvent to purify and separate a mixture comprising compounds X and Y. The following are the solubilities of the two compounds in g/50 mL of hot and cold solvents: Solvent 1 2 3 Hot 2.1 3.3 3.8 X Solubility in g/50 mL solvent Cold 0.5 0.6 3.2 Hot 2.2 3.5 4.0 Y Cold 0.75 0.80 0.85 A. Given the above data, if a mixture containing 10.0 g each of X and Y is to be recrystallized from 10 milliliters of the solvents, what is the best solvent to use? Support your answer by doing a schematic diagran for EACH solvent. B. What is the %recovery of X and Y in the chosen solvent? Show your complete solution. C. What is the %purity of X and Y in the chosen solvent? Show your complete solution.

Eren, Rochelle, and Sarah were assigned to do a recrystallization experiment using three different solvent to purify and separate a mixture comprising compounds X and Y. The following are the solubilities of the two compounds in g/50 mL of hot and cold solvents: Solvent 1 2 3 Hot 2.1 3.3 3.8 X Solubility in g/50 mL solvent Cold 0.5 0.6 3.2 Hot 2.2 3.5 4.0 Y Cold 0.75 0.80 0.85 A. Given the above data, if a mixture containing 10.0 g each of X and Y is to be recrystallized from 10 milliliters of the solvents, what is the best solvent to use? Support your answer by doing a schematic diagran for EACH solvent. B. What is the %recovery of X and Y in the chosen solvent? Show your complete solution. C. What is the %purity of X and Y in the chosen solvent? Show your complete solution.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter13: The Chemistry Of Solutes And Solutions

Section13.6: Expressing Solution Composition

Problem 13.8E

See similar textbooks

Similar questions

The solubility of benzoic acid (HC7H5O2), is 0.34 g/100 mL in water at 25C and is 10.0 g/100 mL in benzene (C6H6) at 25C. Rationalize this solubility behavior. (Hint: Benzoic acid forms a dimer in benzene.) Would benzoic acid be more or less soluble in a 0.1-M NaOH solution than it is in water? Explain.
How many theoretical plates are required to produce a solution with a mole fraction of hexane greater than 0.90? Figure B A temperature-composition diagram for hexane (C6H14)-heptane (C7H16) mixtures.
Analysis of a compound gave 39.50% C, 2.21% H, and 58.30% Cl. When 0.855 g of this solid was dissolved in 7.50 g of naphthalene, the solution had a freezing point of 78.0C. The pure solvent freezes at 80.0C; its molal freezing point constant is 6.8C/m. a What is the molecular formula of the compound? b What is its molecular weight to the nearest 0.1 g?
You dissolve 5.0 mg of iodine, I2, in 25 mL of water. You then add 10.0 mL of CCl4 and shake the mixture. If I2 is 85 times more soluble in CCl4 than in H2O (on a volume basis), what are the masses of I2 in the water and CCl4 layers after shaking? (Figure 13.5.)
Patients undergoing an upper gastrointestinal tract laboratory test are typically given an X-ray contrast agent that aids with the radiologic imaging of the anatomy. One such contrast agent is sodium diatrizoate, a nonvolatile water-soluble compound. A 0.378-m solution is prepared by dissolving 38.4 g sodium diatrizoate (NaDTZ) in.l.60 102 mL water at 3 1.2C (the density of water at 31.2C is 0.995 g/cm3). What is the molar mass of sodium diatrizoate? What is the vapor pressure of this solution if the vapor pressure of pure water at 31.2C is 34.1 torr?
A gaseous solute dissolves in water. The solution process has H=15 kJ. Its solubility at 22C and 6.00 atm is 0.0300 M. Would you expect the solubility to be greater or less at (a) 22C and 1 atm? (a) 18C and 6 atm? (a) 15C and 10 atm? (a) 35C and 3 atm?
A solution is made by dissolving 0.455 g of PbBr2 in 100 g of H2O at 50C. Based on the data in Table 8-1, should this solution be characterized as a. saturated or unsaturated b. dilute or concentrated
Dimethylglyoxime [DMG, (CH3CNOH)2] is used as a reagent to precipitate nickel ion. Assume that 53.0 g of DMC has been dissolved in 525 g of ethanol (C2H5OH). s The red, insoluble compound formed between nickel(II)ion and dimethylglyoxime (DMG) is precipitated when DMG is added to a bask solution of Ni2+ (aq). (a) What is the mole fraction of DMG? (b) What is the molality of the solution? (c) What is the vapor pressure of the ethanol over the solution at ethanols normal boiling point of 78.4 C? (d) What is the boiling point of the solution? (DMG does not produce ions in solution.) (Kbp for ethanol = +1.22 C/m)
4. You wish to purify 10.0 grams compound A, which is contaminated with O.12 grams of B by recrystallization from water. Assuming the water solubility table below, answer the following questions: Solubility at 20°C (g/100 mL) Solubility at 100°C (g/ 100mL) Compound A Compound B 0.25 15.0 0.30 1.00 (a) What volume of boiling water is required to dissolve all of compound A? (b) Upon cooling to 20°C, how many grams of compound A should crystallize? (c) Do you expect compound A to be pure or is some of compound B likely to crystallize too? Explain.
2. The table below shows the solubility data (in g of solute per 100 mL solvent) for compound X in several different solvents. Solvent Water Toluene Solubility (0°C) 2.2 0.45 Solubility Hot 2.5 5.0 Which solvent would be the best choice for recrystallizing Compound X ? Why? Ethanol 4.2 8.3
A 690 g of 59% strontium bromide solution is cooled from 60 oC to a certain temperature. Upon addition of around 2 g of strontium bromide, excess solute above saturation started to crystallize. Total recovered crystals is 146.003 g. At what temperature is the solution cooled?
A mixture of 5.0 g A, 5.0 g 8, and 5.0gC were separated by recrystallization using ethyl acetate as the recrystallization solvent. Shown below are the solubilities (in g/100 mL solvent) of A B, and Cin ethyl acetate. A. C. cold hot cold hot cold Hot 1.7 2.5 22 3.6 1.6 5.3 What is the percent purity of the obtained crystal after one recrystallization? Answer