When doing the Recrystallization of benzoic acid. Is it better to use just water as the...
Homework Answers
Water itself is a good solvent for recrystallization of benzoic acid, since benzoic acid has a poor solubility in cool water, but a high solubility in hot water. Since benzoic acid is much more soluble in hot water as compared to cold, small amounts of hot water are added to dissolve the benzoic acid. If the hot, saturated, aqueous solution of benzoic acid is cooled, the solution becomes supersaturated, and the supersaturated solution crystallizes.
using the solvent pair (methanol/water) will lead to the higher solubility of benzoic acid in the solvent pair at ambient temperature, leading to the difficulty of recrystallization of benzoic acid in a high yield.
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When doing the Recrystallization of benzoic acid. Is it better to use just water as the...
12) Water was found to be a suitable solvent for recrystallization of benzoic acid. How should...
12) Water was found to be a suitable solvent for recrystallization of benzoic acid. How should the solution of benzoic acid be prepared during the recrystallization? a. by dissolving the solid in a maximum volume of the boiling solvent b. by dissolving the solid in a minimum volume of the boiling solvent C. by adding 10 ml of hot solvent, in small portions to the solid and stirring until the solid dissolves x d. by adding 10 ml of the...
Recrystallization Experiment Postlab Questions 1. Calculate the percent recovery of benzoic acid and aspirin. 2. What...
Recrystallization Experiment Postlab Questions 1. Calculate the percent recovery of benzoic acid and aspirin. 2. What are some of the properties of an ideal recrystallization solvent? 3. Why is ice cold solvent used to rinse the purified crystals? 4. If the hot solution were immediately placed in an ice water bath during the recrystallization process instead of first cooling to room temperature, how might this affect the results?
1.7 grams of benzoic acid dissolves in 1 liter of water at 0 degrees Celsius 56.3...
1.7 grams of benzoic acid dissolves in 1 liter of
water at 0 degrees Celsius
56.3 grams of benzoic acids dissolves in 1 liter of
water at 100 degrees Celsius
1. Calculate the percent recovery of benzoic acid and aspirin. 2. What are some of the properties of an ideal recrystallization solvent? 3. Why is ice cold solvent used to rinse the purified crystals? 4. If the hot solution were immediately placed in an ice water bath during the recrystallization...
A. For the recrystallization lab, you had 1.0 grams of benzoic acid. What volume of water...
A. For the recrystallization lab, you had 1.0 grams of benzoic acid. What volume of water would it take to dissolve the sample at 100 °C given the solubility data below for benzoic aid in water? You cool the solution of the given volume of water from part a to 0 °C, what mass of benzoic acid remains dissolved in the solution and what mass precipitates out? b. If you then let the solution increase to 25 °C, what mass...
You would recrystallize benzoic acid using water as the solvent rather than methanol. Explain why.
You would recrystallize benzoic acid using water as the solvent rather than methanol. Explain why.
1. Can benzoic acid be recrystallized using Dichloromethane as a solvent instead of Water. Justify your...
1. Can benzoic acid be recrystallized using Dichloromethane as a solvent instead of Water. Justify your answer. 2. Benzoic acid purified using recrystallization melted at 10 oC less than its actual M.P. Is the sample pure? List possible errors that could have happened during the recrystallization. 3. Where in the IR spectrum of benzoic acid would you expect to find the C=O and C=C bond?
The solubility of benzoic acid in water is: 0.29g/100mL at 20°C 6.8g/100mL at 100°C a) What...
The solubility of benzoic acid in water is: 0.29g/100mL at 20°C 6.8g/100mL at 100°C a) What is the maximum mass of benzoic acid that would crystallize out of solution if 8.0g of benzoic acid was dissolved in 150mL of boiling water, filtered while hot, cooled to room temperature (20°C), filtered with suction and dried? b) If you had a 2.00g sample of impure benzoic acid, what volume of water would you use for recrystallization to give a good recovery of...
14. (3 pts.) The ionized benzoic acid dissolves better in water than it does in diethyl ether, which is how and why it...
14. (3 pts.) The ionized benzoic acid dissolves better in water than it does in diethyl ether, which is how and why it is extracted into the water phase. Give the most important IMFs that are responsible for solubilizing the benzoic acid anion in the water. Give also the most important IMFs that are responsible for solubilizing the sodium cation in the water. The kinds of strong IMF that could be present are ion-dipole, hydrogen bonding (ignore dipole-dipole and induced...
Pre Lab Question Please answer in complete sentences. Describe the characteristics of a good recrystallization solvent...
Pre Lab Question Please answer in complete
sentences.
Describe the characteristics of a good recrystallization solvent The solubility of a compound is 59 g per 100 mL in boiling methanol and 30 g per 100 mL in cold methanol, whereas its solubility in water is 7.2 g per 100 mL at 95 degree C and 0.22 g per 100 mL at 2 degree C. Which solvent would be better for recrystallization? Explain why. In what circumstances is it necessary to...
4. Based on what you know about solubility and recrystallization, which of the following solid/solvent combinations...
4. Based on what you know about solubility and recrystallization, which of the following solid/solvent combinations can be used for recrystallization? (5 pts) A. Naphthalene/ water B. Urea/hexane c. Benzoic acid/ water D. All of the above
12) Water was found to be a suitable solvent for recrystallization of benzoic acid. How should the solution of benzoic acid be prepared during the recrystallization? a. by dissolving the solid in a maximum volume of the boiling solvent b. by dissolving the solid in a minimum volume of the boiling solvent C. by adding 10 ml of hot solvent, in small portions to the solid and stirring until the solid dissolves x d. by adding 10 ml of the...
Recrystallization Experiment Postlab Questions 1. Calculate the percent recovery of benzoic acid and aspirin. 2. What are some of the properties of an ideal recrystallization solvent? 3. Why is ice cold solvent used to rinse the purified crystals? 4. If the hot solution were immediately placed in an ice water bath during the recrystallization process instead of first cooling to room temperature, how might this affect the results?
1.7 grams of benzoic acid dissolves in 1 liter of
water at 0 degrees Celsius
56.3 grams of benzoic acids dissolves in 1 liter of
water at 100 degrees Celsius
1. Calculate the percent recovery of benzoic acid and aspirin. 2. What are some of the properties of an ideal recrystallization solvent? 3. Why is ice cold solvent used to rinse the purified crystals? 4. If the hot solution were immediately placed in an ice water bath during the recrystallization...
A. For the recrystallization lab, you had 1.0 grams of benzoic acid. What volume of water would it take to dissolve the sample at 100 °C given the solubility data below for benzoic aid in water? You cool the solution of the given volume of water from part a to 0 °C, what mass of benzoic acid remains dissolved in the solution and what mass precipitates out? b. If you then let the solution increase to 25 °C, what mass...
14. (3 pts.) The ionized benzoic acid dissolves better in water than it does in diethyl ether, which is how and why it is extracted into the water phase. Give the most important IMFs that are responsible for solubilizing the benzoic acid anion in the water. Give also the most important IMFs that are responsible for solubilizing the sodium cation in the water. The kinds of strong IMF that could be present are ion-dipole, hydrogen bonding (ignore dipole-dipole and induced...
Pre Lab Question Please answer in complete
sentences.
Describe the characteristics of a good recrystallization solvent The solubility of a compound is 59 g per 100 mL in boiling methanol and 30 g per 100 mL in cold methanol, whereas its solubility in water is 7.2 g per 100 mL at 95 degree C and 0.22 g per 100 mL at 2 degree C. Which solvent would be better for recrystallization? Explain why. In what circumstances is it necessary to...
4. Based on what you know about solubility and recrystallization, which of the following solid/solvent combinations can be used for recrystallization? (5 pts) A. Naphthalene/ water B. Urea/hexane c. Benzoic acid/ water D. All of the above
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