In liquid, extraction, why is it necessary to turn the separatory funnel upside down and to open the stopcock?

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

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Q: d) In a typical HPLC column, 150 atm of pressure is required to push the mobile phase through the…

A: In this question, we have to find out the correct answer of given problem by the help of the concept…

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

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Q: True or false. A primary standard solid must be weighed accurately and diluted to an accurately…

A: Analytical chemistry.

Q: What is the benefit of using fluted filter paper instead of not folding it?

A: “Fluted “ filter paper (LEFT) is used when we wish to separate a liquid and a solid, keeping the…

Q: 5. Let's say naphthoic acid was isolated by vacuum filtration from our procedure explained in the…

A: Both methods are useful for removing moisture. Vaccum drying is most effective and gentle drying…

Q: Vaccum filtration is the major technique used in this experiment. The following step sequences are…

A: The vacuum filter may be described as the approach which is basically used to disparate the solid…

Q: Why is it important to heat the empty evaporating dish at the beginning of the lab procedure of…

A: The percentage of water in Copper (II) sulfate measured by dry crucible than only we get more…

Q: What is the purpose of drying the remaining solid after extraction under a heat lamp?

A: The process, in which water and other solvent is evaporated from the solid-liquid mixture to form…

Q: Why is catalytic dewaxing not considered as a separation process?

A: Since Catalytic dewaxing involves breaking and making bonds, so it is usually referred to as a…

Q: What are the dispersed phase and dispersion medium in milk?

A: Dispersed Phase: The phase or particles which are present in the form of colloidal particles is…

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

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Q: After the liquid-liquid extraction of caffeine, you are removing the dichloromethane solvent on the…

A: The rotary evaporator may be described as the physical efficient technique that is used to convert…

Q: Why is splitless injection used with purge and trap sample preparation?

A: The collection of all of the analyte from the unknown and to inject whole of the analyte into the…

Q: While recrystallizing, what should you do if you have solid particles that don’t dissolve even after…

A: Recrystallization is the process by which non volatile organic solids are purified. In this method…

Q: 1. What is the purpose of application of steam distillation method?

A: Applying basics concept of steam distillation purification method.

Q: look for at least three extraction methods for perfumery materials.

A: There are several methods which are used for extraction of the perfumery materials from different…

Q: Of Aspirin, ethanol, acetaminophen, ethyl acetate, hexane, and water which could go undetected…

A: HPLC or high perfomance liquid chromatography is a usefull technique to separate and analyse…

Q: What are the criteria for a good recrystallization solvent?

A: Recrystallization refers to the phenomenon where solid compounds are purified. In the…

Q: Why do we use more than one solvent in the cold extraction method?

A: In chemistry like dissolves like

Q: Explain how solvent trapping and cold trapping work in splitless injection.

A: In Gas chromatography both split and splitless injection takes place. Split injection is used when…

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: Why is it necessary to allow enough time for your samples to dry?

A: during the organic synthesis, product may contain the impurity due the presence of the solvent

Q: Briefly discuss how to identify the unknown compound by using mixed melting point method.

A: Mixed melting point calculation is a method for the determination of the identity of the unknown…

Q: In a liquid - liquid extraction, what is preferable? Three extractions with a small volume or one…

A: Liquid-liquid extraction is also known as solvent extraction or solvent partitioning. In this…

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: At what step in the recrystallization process would a colored impurity be removed?

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Q: In an experiment the essential oils from herbs, were extracted with water. Explain how you will…

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Q: 4. When performing a melting point on solid compound using a melting point apparatus, two melting…

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Q: What is the purpose of the Claisen adapter in the reflux setup? Select one: to prevent bumping of…

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Q: is mobile phase the eluting solvent?

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Q: What error would occur if the Sep-Pak C18 cartridge (the nonpolar stationary phase) was not…

A: C-18 cartridges are columns that are filled with packing material that act as stationary phase. The…

Q: Why should the washing solvent be cold in the suction filtration step?

A: Suction filtration is the final step for separating the compound from the solution during the…

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: After acid-base extraction why is it important to wash organic layer at least once with pure water?

A: A question based on quantitative analysis, which is to be accomplished.

Q: What is the use of the glass rod in transferring liquid reagents?

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Q: After vacuum filtration why is it important to allow the product to sit out for a few days before…

A: The separation of solids from liquids by passing the mixture through a filter and where, on one…

Q: Explain the fuctions of each part of the reflux set-up

A: Reflux setup consist of three parts -- 1) A heating system 2) a round flask 3) a condenser.  It is a…

Q: Explain why it is needed to filter the solvent before introducing it to the HPLC system

A: Basically there are following two reasons for using filtration during HPLC sample preparation are…

Q: 1.what data must be available when HPLC method is passed on 2.why eluents should be degassed

A: 1.data needed for HPLC: HPLC is High performance liquid chromatography. Chromatography:  It is a…

Q: Why is it required to add drying agent like sodium sulphate to the organic layer which may contain…

A: In an organic solution, there are often traces of water present because water is slightly soluble in…

Q: What are the benefits of using slightly more solvent than necessary when dissoving a compound for a…

A: Recrystallization is a process of purifying a solute when it is soluble in the solvent only on…

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

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

A: The unknown solution contains liquid and impurities.

Q: BRIEFLY explain why steam distillation can be used to purify or isolate temperature-sensitive…

A: A question based on analytical separation that is to be accomplished.

Q: 1. Why does the solid need to be finely ground and then tightly packed in a melting point capillary…

A: The temperature at which the solid melts and starts converting into liquid is called as melting…

Q: What do you think would happen to your recrystallization solution if you did not use a pre- heated…

A: Re-crystallization process is a process in which the compounds which are not soluble in cold solvent…