The ideal recrystallization solvent _______. (Select all that apply.) a.) does not allow crystals to form...
The ideal recrystallization solvent _______. (Select all that apply.)
a.) does not allow crystals to form when cooled b.) dissolves the desired substance when hot c.) dissolves all components readily when cold d.)
dissolves the compound to be purified only when heated e.) has a boiling point lower than the melting point of the compound to be purified
Homework Answers
Ideal recyrstallization solvent -
1) Dissolves the desired substance when hot.
2) Dissolves the compound to be purified only when heated.
3) Has boiling point lower than the melting point of the compound to be purified
(It allows crystals to form when cooled)
(It must not dissolve compound in cold condition)
Add Answer to:
The ideal recrystallization solvent _______. (Select all that
apply.)
a.) does not allow crystals to form...
Impure crystalline (solid) substances can be purified by recrystallization from a suitable solvent. Arrange the steps...
Impure crystalline (solid) substances can be purified by recrystallization from a suitable solvent. Arrange the steps of the recrystallization procedure, from start to finish. Start Weigh the crystals into a tared flask. Dissolve the crude substance in a minimum amount of hot solvent. Filter the hot solution to remove the solid impurities (if present) Allow the solution to cool slowly so crystals form. Filter the crystals. Dry the crystals
If crystals don’t form after the recrystallization flask is cooled in an ice bath, there is...
If crystals don’t form after the recrystallization flask is cooled in an ice bath, there is nothing more to do to gain crystals. True False Question 2 What is the recrystallization solvent for triphenylmethanol? hexanes ethanol a hexanes/ethanol mixture water Question 3 What is the theoretical yield of the product, triphenylmethanol, if 20.0 mmol of benzophenone is the limiting reagent? 3.140 g 3.644 g 5.207 g 20.0 g Question 9 When recrystallizing a solid: hot solvent should be used the...
please answer all parts I am trying to check my answers. Recrystallization of Acetanilide Recrystallization is...
please answer all parts I am trying to check my
answers.
Recrystallization of Acetanilide Recrystallization is an important method used by chemists to purify solid compounds. When a chemist conducts a chemical reaction as shown in Scheme 1, it will rarely go to 100% completion, and will frequently produce byproducts. These byproducts and some of the unreacted starting materials will be present in the end as impurities. Chemists need ways to remove these unwanted impurities so they can isolate their...
Choose four requirements that must be met when choosing a solvent for recrystallization. Solute must be...
Choose four requirements that must be met when choosing a solvent for recrystallization. Solute must be soluble both at room temperature and the boiling point. Solvent must be easily removed (i.e., have a low boiling point and high vapor pressure). Solute may react with the solvent, as long as the reaction is incomplete. Impurities must be insoluble at the boiling point or soluble at room temperature. A small amount of crystals should be obtained. A fine powder should be obtained...
Okay, my answer is wrong, but what is the correct answer and why. Attempt 1 Feedback...
Okay, my answer is wrong, but what is the
correct answer and why.
Attempt 1 Feedback Select the statement that will help produce more pure crystals during recrystallization. Incorrect Seed the solution with the solid product that forms on the spatula While it is important that the solid Make sure that the solid dissolves completely in the cold solvent dissolves in hot solvent rather than Add a little extra solvent after the crystals have completely dissolved. melting, this will not...
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...
A. Recrystallization is an important technique that we used in this lab to purify solids. Answer...
A. Recrystallization is an important technique that we used in this lab to purify solids. Answer the following questions related to this technique, which is outlined in the diagram below. (2 pts. each) Watch ass Watch Glass Hot solvent Insoluble mpurities Dissolve the compound Continue heating if necessary hot solvent Fluted fiter paper Continue heating until half of the solvent is evaporated Vacuum filtration Allowed to cool to room temperature then put in an ice bath HOT Gravity filtration 3....
Question 17 1 pts What solubility properties are important in the selection of a solvent for...
Question 17 1 pts What solubility properties are important in the selection of a solvent for recrystallisation? sparingly soluble in hot solvent and readily soluble in cold solvent readily soluble in both hot and cold solvent sparingly soluble in both hot and cold solvent readily soluble in hot solvent and sparingly soluble in cold solvent Question 18 1 pts How would you modify the procedure given in the Laboratory Manual if you did not know which solvent to use? if...
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,...
Pre Lab Question Please answer in complete sentences. Describe the characteristics of a good recrystallization solvent...
Pre Lab Question Please answer in complete
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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...
Impure crystalline (solid) substances can be purified by recrystallization from a suitable solvent. Arrange the steps of the recrystallization procedure, from start to finish. Start Weigh the crystals into a tared flask. Dissolve the crude substance in a minimum amount of hot solvent. Filter the hot solution to remove the solid impurities (if present) Allow the solution to cool slowly so crystals form. Filter the crystals. Dry the crystals
please answer all parts I am trying to check my
answers.
Recrystallization of Acetanilide Recrystallization is an important method used by chemists to purify solid compounds. When a chemist conducts a chemical reaction as shown in Scheme 1, it will rarely go to 100% completion, and will frequently produce byproducts. These byproducts and some of the unreacted starting materials will be present in the end as impurities. Chemists need ways to remove these unwanted impurities so they can isolate their...
Choose four requirements that must be met when choosing a solvent for recrystallization. Solute must be soluble both at room temperature and the boiling point. Solvent must be easily removed (i.e., have a low boiling point and high vapor pressure). Solute may react with the solvent, as long as the reaction is incomplete. Impurities must be insoluble at the boiling point or soluble at room temperature. A small amount of crystals should be obtained. A fine powder should be obtained...
Okay, my answer is wrong, but what is the
correct answer and why.
Attempt 1 Feedback Select the statement that will help produce more pure crystals during recrystallization. Incorrect Seed the solution with the solid product that forms on the spatula While it is important that the solid Make sure that the solid dissolves completely in the cold solvent dissolves in hot solvent rather than Add a little extra solvent after the crystals have completely dissolved. melting, this will not...
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...
A. Recrystallization is an important technique that we used in this lab to purify solids. Answer the following questions related to this technique, which is outlined in the diagram below. (2 pts. each) Watch ass Watch Glass Hot solvent Insoluble mpurities Dissolve the compound Continue heating if necessary hot solvent Fluted fiter paper Continue heating until half of the solvent is evaporated Vacuum filtration Allowed to cool to room temperature then put in an ice bath HOT Gravity filtration 3....
Question 17 1 pts What solubility properties are important in the selection of a solvent for recrystallisation? sparingly soluble in hot solvent and readily soluble in cold solvent readily soluble in both hot and cold solvent sparingly soluble in both hot and cold solvent readily soluble in hot solvent and sparingly soluble in cold solvent Question 18 1 pts How would you modify the procedure given in the Laboratory Manual if you did not know which solvent to use? if...
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...
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