What properties should ideally be possessed by a recrystallization solvent?

Q: What would likely happen if a hot saturated solution were filtered by vacuum filtration using a…

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Q: Write the principle behind the froth floatation process. What is the role of collectors in this…

A: Various processes are used for extraction of minerals. These minerals are very useful for…

Q: Why should the recrystallization solvent have a fairly low boiling point?

A:

Q: Which of the following solvent systems are not suitable for binary solvent recrystallization?

A: a) water and heptane

Q: 5. Discuss how melting points of the impure sample and recrystallized sample could have been used to…

A: Melting point is the temperature at which there is a change from the solid to the liquid state i.e.…

Q: How does the volume of a solvent affect the purity of the material in recrystallization?

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Q: When finished performing a vacuum distillation it is important to?

A: Vaccum distillation is a type of distillation allows the purification of compounds not readily…

Q: Why is a boiling stone used when solvents are heated to boiling point?

A: Boiling stones are small pieces of black porous rock that are added to solvent or solution.

Q: Make a schematic diagram of the recrystallization procedure.

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Q: Why do we know the aqueous layer is the upper layer during the wash steps?

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Q: For either of these solvents explain why it would be a better choice as a recrystallization solvent…

A: Recrystallization is a technique used to purify compound. For recrystallization, dissolving both…

Q: Why is the final product from recrystallization isolated by vacuum filtration and not by gravity…

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Q: How might cyclohexane give a false positive when choosing a solvent for recrystallization?

A: Melting point of cyclohexane = 6.47 oC   Cyclohexane is not soluble in solvent at high temperature,…

Q: Assume that charcoal and sugar are the two main impurities in the sample of  benzoic acid. Explain…

A: Given is recrystallization of benxoic acid.

Q: Explain the difference between saturated and unsaturatedsolutions.

A: Solution: It can be defined as that the homogeneous mixture of two or more substances. For example:…

Q: Why is it important to use high purity solvents in MS?

A: It is important to use high purity solvents in MS

Q: What are some advantages of the membrane filter technique in the analysis of a water sample? Some…

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Q: Why is it not necessary to dry the Erlenmeyer flask between each trial?

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Q: What impurity was likely removed during the recrystallization necessary ?

A: Recrystallization is the most important method of purifying nonvolatile organic solids.…

Q: What should be done if the percent recovery is greater than 100%? Should the recrystallization…

A: The maximum percent recovery one can get is 100%. If one is getting more than that it's means there…

Q: The glassware which is attached to the condenser to allow proper flow of distillate to the receiving…

A: Borosilicate

Q: Briefly describe on how peptization may occur during washing process of pure compound

A: Peptisation is the process of converting a precipitate into colliodal particles by adding an…

Q: Occasionally you will have solid impurities “trash” in your heated recrystallization solvent. How do…

A: The process used for the purification of organic compounds which are solids at room temperature is…

Q: Why do you have to keep all the equipment hot when removing carbon in recrystallization?

A: Recrystallization is technique used to purify solid compounds.

Q: The reagent that is used in the preparation the sample and does not contain the analyte is called

A: The reagent blank is a solution that contains all the same components as in sample solution but no…

Q: What effect would the incomplete drying of a sample (e.g., the incomplete removal of a…

A: The melting point will be lowered and broadened.

Q: Why should the burette not be completely emptied when dispensing?

A: Since, burette is used for titration to determine strength of a solution.  We can take appropriate…

Q: Why use plastic reagent bottle for the storage of the standard NaOH solution instead of typical…

A: NaOH is a base. It is hygroscopic in nature. Hygroscopic means tends to absorb moisture from air.…

Q: In liquid, extraction, why is it necessary to turn the separatory funnel upside down and to open the…

A: Liquid-liquid extraction is also called solvent extraction is a method of separating compound from…

Q: is mobile phase the eluting solvent?

A:

Q: Why would it be possible to get less than 100% recovery for a recrystallization?

A: The question is based on the concept of recrystallization. recrystallization is a purification…

Q: If we are recrystallizing a PURE compound, what will happen to the sample if we cool the solution…

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Q: Classify these solvents as either protic or aprotic solvents.

A: A protic solvent is a compound containing at least one hydrogen atom bonded to anelectronegative…

Q: Contrast the physical appearance of the crude material before the recrystallization and that of the…

A: A question based on re-crystallization, which is to be accomplished.

Q: Why is it important to cool slowly during recrystallization

A: recrystallization is a process in which we dissolve an impure crystal in a solvent at high…

Q: Recrystallization and Melting Points Why do you need to heat a sample slowly when taking a melting…

A: Interpretation: We need to tell why we heat sample slowly during determination of melting point.

Q: What will be the soufflé’s volume after cooking? Show complete solution

A: The pressure of the soufflé’s batter remains same and we need to relate the volume change of gas…

Q: While performing a crystallization, you obtain a light tan solution after dissolving your crude…

A: It is observed that a light tan solution is obtained and because of this, it is better to filter it…

Q: You are tasked with performing a recrystallization. You have 3 potential solvents to use, but you…

A: The solution is given below -

Q: In handling reagent, excess reagents should be

A: The quantity of the reagent once you taken from the reagent bottle, the excess of reagent after…

Q: How to get maximum % recovery from recrystallization and crude weight

A:

Q: which procedure will produce 200ml of a solution that is 2.5%by volume alcohol of water?

A: The percentage by volume of the solution is 2.5 %. The V/V % can be calculated by the following…

Q: When conducting a recrystallization what should generally be true when comparing the compounds…

A: Recrystallization is an experimental technique of separating pure compound from the solution…

Q: Why is it necessary to pulverize the sample in doing the experiment of melting point?

A: Pulverization: It is the process of grinding or crushing a solid substance in order to get a powder…

Q: An overachieving student determines that their neutral liquid unknown contains impurities. Suggest…

A: The unknown solution contains liquid and impurities.

Q: Why might it be necessary to employ procedures such as the use dilution and in-use tests?

A: Step :1  A use dilution test is the another method for testing the efficacy of the disinfectant.In…

Q: Describe the procedure of how to collect and dry your newly recrystallized compound.

A: Recrystallization is the method that is used to purify the organic compounds. It involves the…