Homework Answers
10.
Attributes of a good recrystallization solvent:
1) The compound to be recrystallized should not be highly soluble in the solvent. If the compound is highly soluble then it will stay dissolved and will not recrystallize.
2) The soluble impurities should be highly soluble in the solvent so that they don't recrystallize or precipitate out before the recrystallization of the desired compound.
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#10 What are the attributes of a good recrystallization solvent? (Two Attributes) (4 points) #10 What are the...
why is p ether not a good solvent for recrystallization of acetanilide
why is p ether not a good solvent for recrystallization of acetanilide
3. Describe the characteristics of a good recrystallization solvent. L uftetallizado
3. Describe the characteristics of a good recrystallization solvent. L uftetallizado
what are the properties of an ideal recrystallization solvent?
what are the properties of an ideal recrystallization solvent?
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...
What are the advantages of using a solvent pair for recrystallization? Select all that apply. What...
What are the advantages of using a solvent pair for
recrystallization? Select all that apply.
What are the advantages of using a solvent pair for recrystallization? Select all that apply. You can quickly make the solution supersaturated by adding more of the solvent with greater dissolving power. You can calculate the precise amounts of the solvents needed for recrystallization. You can quickly make the solution supersaturated by adding more of the solvent with less dissolving power. You don't have 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
4. What is the point of adding a poor solvent in a mixed-solvent recrystallization? 5. Predict...
4. What is the point of adding a poor solvent in a mixed-solvent recrystallization? 5. Predict the product if you had used HBr without adding hydrogen peroxide. In your structure, specify which regioisomer would form and provide a 1-sentence explanation for your choice. [Hint: your explanation should contain the term "carbocation stability"] 6. Predict the major organic products of the following reactions. Draw the structures of all Reaction Bromine generation: 2 HBr + H2O2 Br2 + 2 H2O Bromine addition:...
Recrystallization/Melting Point 2-ethoxybenzamide is the unknown. 1. Adding enough solvent to achieve a “saturated” solution is...
Recrystallization/Melting Point 2-ethoxybenzamide is the unknown. 1. Adding enough solvent to achieve a “saturated” solution is necessary for recrystallization. a. What is the problem with adding too much solvent? b. What is the problem with adding too little solvent? 2. Why is fluted filter paper preferred over standard conical filter paper for the filtration of the recrystallized solid? 3. What is the purpose of adding boiling stones when heating solutions to a boil? 4. Name 2 requirements that must be...
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...
03) Based on what you know about solubility and recrystallization, which of the following solid/solvent combinations...
03) 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 04) Which of the following is something you can NOT determine by looking at a TLC plate? (4 pts) a) Polarity b) Impurities c) Retardation factor d) Retention time
3. Describe the characteristics of a good recrystallization solvent. L uftetallizado
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...
What are the advantages of using a solvent pair for
recrystallization? Select all that apply.
What are the advantages of using a solvent pair for recrystallization? Select all that apply. You can quickly make the solution supersaturated by adding more of the solvent with greater dissolving power. You can calculate the precise amounts of the solvents needed for recrystallization. You can quickly make the solution supersaturated by adding more of the solvent with less dissolving power. You don't have 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
4. What is the point of adding a poor solvent in a mixed-solvent recrystallization? 5. Predict the product if you had used HBr without adding hydrogen peroxide. In your structure, specify which regioisomer would form and provide a 1-sentence explanation for your choice. [Hint: your explanation should contain the term "carbocation stability"] 6. Predict the major organic products of the following reactions. Draw the structures of all Reaction Bromine generation: 2 HBr + H2O2 Br2 + 2 H2O Bromine addition:...
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...
03) 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 04) Which of the following is something you can NOT determine by looking at a TLC plate? (4 pts) a) Polarity b) Impurities c) Retardation factor d) Retention time
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