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

Q: What substance is used to help dry your sample rapidly?

A: The substances that rapidly absorb moisture from the surrounding atmosphere or dry it out are called…

Q: Will recrystallization work as a purification technique on all samples? If the sample contained more…

A: Recrystallization techniques works only on the solid samples which is used to purify them. This…

Q: Enumerate three properties of a good extracting solvent in liquid-liquid extraction.

A: Liquid-liquid extraction is a technique of separation of desired constituents from a solution by the…

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

A: a) water and heptane

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: What is 2D gel electrophoresis

A: 2D gel electrophoresis is a technique for detection and separation of proteins. It is a combination…

Q: What happens if the spots are made too large when preparing a TLC plate for development?

A: This question is related to chromatography.

Q: After the drying step (with sodium sulfate), there was still water in the solution.  What should the…

A: Topic : use of drying agent (Ex - Sodium Sulfate)

Q: A supporting electrolyte is usually added to the analyte solution to minimize solution…

A: 1. SOLUTION - The correct option is (a) minimize solution resistance According to the question -…

Q: How do strong and weak synthetic ion-exchange resins differ in structure?

A: Ion-exchange resins: Resins with large pours cavity is hold the ions by its ionic property. Cationic…

Q: Capillary electrophoresis differs from other chromatographic methods because:

A: It uses unique detectors.

Q: Before developing a TLC plate you should _______. a. Make sure to mark the origin with a pen b.…

A: While developing a TLC plate, we should always use a pencil (not pen) because: Pencils are cheap and…

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

A:

Q: Write the dispersion medium and dispersed phase in milk.

A: Phase of solution in which colloidal particles are present termed as dispersed phase. The phase in…

Q: Why is it important to pre-treat the solid before leaching?

A: It is important to pre-treat the solid before leaching because of Agglomeration ( this stage…

Q: Find the Rf value from given data. Thank you

A: In Thin Layer Chromatography, the compounds can be separated by the solvents in the TLC plate. The…

Q: Why is steam distillation and not fraction distillation used to extract limonene from citrus peels.

A: Steam distillation: It is a purifying technique which includes distilling of water with volatile and…

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

A:

Q: Post-lab Questions: does this say about the purity of your solid?

A: Answer of 1st question as per guidelines can only answer 1 if you want to ask more send them one by…

Q: Name 3 adsorbents used in TLC. Mention their use and properties.  Why is it important to use a…

A: 3 adsorbents used in TLC -  1. Silica gel : Silica gel is by far the most widely used adsorbent and…

Q: Why is it important to handle the TLC plate in such a way that your fingers do not come in contact…

A: Chromatography works on the principle that different compounds will have different solubilities and…

Q: What are the possible reasons why there are no spots on the Developed Plate after analysis?

A:

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: 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: Give at least five factors to consider when performing chromatography (paper, thin-layer, liquid,…

A: Chromatography is a technique that is used for the separation of components of a mixture.  The…

Q: What is the purpose of drying the organic layer with a drying agent like anhydrous magnesium…

A: In separation of organic compound we use two solvent

Q: Analysis of protein purity using two-dimensional electrophoresis could involve

A:

Q: Before applying the eluent on the column, why is it important to drain the solvent to a level right…

A:

Q: is mobile phase the eluting solvent?

A:

Q: Is the mobile phase for your TLC and column chromatography more or less polar than the stationary…

A: Mobile phase: It is the phase that is getting movement in the column. The sample that has to be…

Q: Determine the Kovats retention index for all six analytes.

A: In gas chromatography, Kovats retention index is used to convert retention times into…

Q: Write the Separation of heavy metals using solvent extraction technique.

A: Solvent extraction is an analytical method in which constituents are separated based on their…

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

A:

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: Student A did not see any spots on her TLC plate after visualization under iodine vapor. Which of…

A: Thin layer chromatography

Q: What roles do solvent, density and polarity play in liquid/liquid extraction

A: i. Solvent =  In liquid - liquid extraction, the solvent which is needed to be extracted should not…

Q: To identify 1° alcohol from 2° alcohol and 2° alcohol from 3° alcohol giving Immiscible layer as the…

A:

Q: What happens if the spots are made too small when preparing a TLC plate for development?

A:

Q: When extracting an aqueous solution with an organic solvent and after agitation and settling, the…

A: Given information : When extracting an aqueous solution with an organic solvent and after agitation…

Q: Mention the relative sizes of hard gelatin capsule with their corresponding volume and fill weight…

A: HARD GELATIN CAPSULES: Hard gelatin capsules are modern invention which created a great impact in…

Q: a) What is capillary electrophoresis used for? b) Describe electrophoresis. c) Describe…

A: Since you have posted multipart of question as per the guidelines i have solved first three subparts…

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…