Question

4. A student is presented with a heterogeneous mixture of two solids (A & B). Using the table provided below, determine which of the following solvents (X, Y, or Z) would not be an appropriate choice (or choices) for isolating and recrystallizing Unknown A from Unknown B? Explain the reasoning behind your decision(s) in detail. In addition, explain why the remaining solvent (or solvents) would be acceptable options for the proposed experiment. Solvent X Solvent Y Solvent Z High Room Room High Room Temperature TemperatureTemperature Temperature Temperature Temperature Solubility of Unknown A (g/100 mL) Solubility of Unknown B (g/100 mL;) 4.33 4.20 3.23 0.60 5.25 0.18 0.72 0.51 2.14 0.34 0.003 0.001

Answer 1

4. A student is presented with a heterogeneous mixture of two solids (A & B). Using the table provided below, determine which of the following solvents (X, Y, or Z) would not be an appropriate choice (or choices) for isolating and recrystallizing Unknown A from Unknown B? Explain the reasoning behind your decision(s) in detail. In addition, explain why the remaining solvent (or solvents) would be acceptable options for the proposed experiment Solvent X Solvent Y Solvent Z Room High Room High Room ratureTe ature Te rature Te ature T ratureT rature Sohubility of Unknown A (g/100 mL) Sohibility of Unknown B (g/100 mL) 4.33 4.20 3.23 0.60 5.25 0.18 0.72 0.51 2.14 0.34 0.003 0.001 The best solvent for re-crystallization is that solvent which dissolve the compound in hot condition and un-dissolved in cold condition. So to re- crystallization first we dissolvent the unknown compound in proper solvent in hot condition then filter it to remove impurity.now put the solution for decreasing temperature after some time we will get crystal of pure compound Thus for un-known compound A best solvent isZ and for un-known compound B best solvent is Y