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4. 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...
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. The melting point of unknown A was measured to be 110-120°C and unknown B was...
3. The melting point of unknown A was measured to be 110-120°C and unknown B was measured to be 105-109°C. What statement would make the best conclusion about the identity and purity of the product? (4 pts) A. Unknown A range of 110-120°C is the pure substance. Unknown B range of 105-109°C contains impurities. B. Unknown B range of 105-109°C is the pure substance. Unknown A range of 110-120°C contains impurities. C. Both Unknown A and B are pure substances....
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...
Which if the following favors the solubility of an ionic solid in a liquid solvent? A)...
Which if the following favors the solubility of an ionic solid in a liquid solvent? A) A large magnitude of the solvation energy of the ions B) A small magnitude of the lattice energy of the solute C) A large polarity of the solvent D) All of the above E) None of the above
The student loads the solid onto a column, prepacked with silica gel, and elutes the column...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column with an appropriate solvent system to allow the components to be completed separated. 11. Based on your understanding of column chromatography, which of the following solvent systems is most likely to yield the best separation of the two components in this mixture? Please explain your answer BRIEFLY (5 pts)! The ranking of solvent polarity is: MeOH>ethyl acetate> hexane (ie, MeOH is the most polar)....
Benzydrol will be recrystallized from hexane during this experiment. Please identify the following statements about recrystallization...
Benzydrol will be recrystallized from hexane during this experiment. Please identify the following statements about recrystallization as true or false. Select all that are True. 1 Start heating the flask with just enough solvent in the flask to cover the sample. 2 When you collect your crystals you can wash them with a small amount of the recrystallization solvent, but you should cool the solvent down in an ice bath before using it. 3 If you are short on time,...
When choosing a solvent for recrystallization, you should choose one in which the solid to be...
When choosing a solvent for recrystallization, you should choose one in which the solid to be recrystallized is: a) soluble at any temperature b) insoluble at any temperature c) soluble at high temperature but insoluble at low temperature d) insoluble at high temperature but soluble at low temperature
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:...
7. (4 pts) For each of the following solid organic molecules, circle the solvent that would...
7. (4 pts) For each of the following solid organic molecules, circle the solvent that would be the best for re-crystallization. CH3 HN Н3Слл CH3 "CH3 OH HO H2N-NH2 Water Water Water Water 95% Ethanol 95% Ethanol 95% Ethanol 95% Ethanol Hexane Hexane Hexane Hexane
Recrystallization of Acetanilide was conducted using water as our solvent. First we had to choose a...
Recrystallization of Acetanilide was conducted using water as our solvent. First we had to choose a solvent based (water was chosen as our solvent due to it not dissolving acetanilide at room temp but dissolved it when heated) Then we performed recrystallizaation, vacuum filtration and then melting point measurements. For the post lab discussion for recrystallization of acetanilide report we have to address several different arguments. The ones below I'm not sure what to focus on to completely defend what...
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. The melting point of unknown A was measured to be 110-120°C and unknown B was measured to be 105-109°C. What statement would make the best conclusion about the identity and purity of the product? (4 pts) A. Unknown A range of 110-120°C is the pure substance. Unknown B range of 105-109°C contains impurities. B. Unknown B range of 105-109°C is the pure substance. Unknown A range of 110-120°C contains impurities. C. Both Unknown A and B are pure substances....
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...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column with an appropriate solvent system to allow the components to be completed separated. 11. Based on your understanding of column chromatography, which of the following solvent systems is most likely to yield the best separation of the two components in this mixture? Please explain your answer BRIEFLY (5 pts)! The ranking of solvent polarity is: MeOH>ethyl acetate> hexane (ie, MeOH is the most polar)....
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:...
7. (4 pts) For each of the following solid organic molecules, circle the solvent that would be the best for re-crystallization. CH3 HN Н3Слл CH3 "CH3 OH HO H2N-NH2 Water Water Water Water 95% Ethanol 95% Ethanol 95% Ethanol 95% Ethanol Hexane Hexane Hexane Hexane
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