Question

what is the minimum amount of solvent (water) in ml required to recrystallize 5.2 grams of salicylic acid contaminated with 1.3% benzoic acid? compound solubility in water at 25c solubility in water at 100c salicylic acid 0.26 g/100ml 7.5 g/100ml benzoic acid 0.34g/100ml 5.6g/100 ml a. 1529 ml b. 792 ml c. 69 ml d. 93 ml e. 2000 ml 8. if the recrystallized material from question 7 is isolated by filtration at room temperature, calculate the expected % recovery of salicylic acid. a. 100 % b. 87 % c. 94 % d. 92 % e. 96 % 9. determine the amount of compound a that would be extracted into 8.0 ml of diethyl ether after one extraction of 7.00 g of compound a dissolved in 12.5 ml of water. the distribution coefficient (kd) of compound a in diethyl ether and water is 3.5. (2 pts) a. 4.83 g b. 4.97 g c. 3.96 g d. 5.12 g e. 6.44 g 10. if the extracted amount of compound a in question 9 is recovered by separating the diethyl ether layer from the water layer [using a separatory funnel] and then evaporating diethyl ether, calculate the % recovery of a for this extraction process. (1.5 pts) a. 69 % b. 71 % c. 57 % d. 73 % e. 92 %

Answer 1

Step-by-step explanation:

2.4 Solvent. is the minimum amount of solvent (water) in ml required to recrystallize 5.2 grams of salicylic acid contaminated with 1.3% benzoic acid? compound solubility in water at 25c solubility in water at 100c salicylic acid 0.26 g/100ml 7.5 g/100ml benzoic acid 0.34g/100ml 5.6g/100 ml a. 1529 ml b. 792 ml c. 69 ml d. 93 ml e. 2000 ml 8. if the recrystallized material from question 7 is isolated by filtration at room temperature, calculate the expected % recovery of salicylic acid. a. 100 % b. 87 % c. 94 % d. 92 % e. 96 % 9. determine the amount of compound a that would be extracted into 8.0 ml of diethyl ether after one extraction of 7.00 g of compound a dissolved in 12.5 ml of water. the distribution coefficient (kd) of compound a in diethyl ether and water is 3.5. (2 pts) a. 4.83 g b. 4.97 g c. 3.96 g