What effect would the incomplete drying of a sample (e.g., the incomplete removal of a recrystallization solvent) have on the melting point?

Q: Substance used as an adsorbent in the crystallization of acetanilide

A: Answer - Acetanilide - Acetanilide is used as an inhibitor of hydrogen peroxide decomposition and is…

Q: All three of these are gas chromatography runs from my sample. I'm trying to figure out what it…

A: To find the reason for varied retention times and intensities

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: What should you do and not do when mixing the organic and aqueous phases during a liquid extraction?…

A: The amount of a substance that moves into the solvent depends on the interaction between substance…

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: Why is water not a good recrystallization solvent for sodium benzoate? a. Sodium benzoate is…

A: Water is not a good recrystallization solvent for sodium benzoate.

Q: Give some reasons that would lead you to purify a liquid by using vacuum distillation rather than by…

A: Distillation under reduced pressure is called vacuum distillation and is generally employed for…

Q: What are the different melting point apparatus that are available for routine analysis? Describe…

A: A melting point apparatus measures the melting Point of a given substance.

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: During heating, some solution of NaCl splattered out of the evaporating dish. How would this affect…

A: Given: During heating, some solution of NaCl splattered out of the evaporating dish.

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

A:

Q: Why is filtration of a gelatinous precipitate done while the solution is still hot?

A: The filtration of a gelatinous precipitate done while the solution is still hot.

Q: In chromatography, if the temperature of oven increases, what will be its effect on retention time…

A: Chromatography It is the separation and purification technique used in which a stationary phase and…

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

A:

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: When you prepare your sample to run through the column chromatography , what is the first proper…

A: For the column chromatography the sample should be properly dissolved in an appropriate solvent

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

A:

Q: How will the following changes affect the retention time of the solute in supercritical fluid…

A: Supercritical fluid chromatography (SFC) is an analytic techniques used for separation similar to…

Q: 50 g of salt was dissolved in 250 g of water. Find the mass fraction of salt in the extracted…

A: Mass fraction: It defined as WB = mb/m

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

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

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: 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: 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 are the functions  and procedure of analysis of many volatile organic molecules by using  Gas…

A: Gas chromatography (GC) is an analytical technique used to separate the chemical components of a…

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: In recrystallization, fluted filter paper is used instead of a regular cone because it minimizes its…

A: In recrystallization, an impure solid compound is mixed with hot solvent to form a saturated…

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: Chromatography is a separation technique. What is the physical or chemical basis for separation of…

A: The separation relies on the relative affinity of compounds towards both the phases. The compounds…

Q: Can acetic acid be used as the mobile phase in  kool aid chromatography over isopropyl alcohol?

A: Given Can acetic acid be used as the mobile phase in  kool aid chromatography over isopropyl alcohol

Q: 2. During heating, some solution of NaCl spattered out of the evaporating dish. How would this…

A: The question is based on the concept of experimental chemistry. We have to evaluate the impact of…

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: 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: Isopropanol and water are miscible, meaning they can be combined in any ratio. So why were they…

A: 1. Isoprapanol and water are miscible due to formation of intermolecular hydrogen bonding.  2. But,…

Q: Why is benzoic acid used as a solvent when making up the glucose stock standard solution?

A: Benzoic acid s an aromatic carboxylic acid.  This is a crystalline colourless solid. Benzoic acid is…

Q: In your own words, discuss the reason why stray light should be minimized. How does stray light…

A:

Q: What is the aim of (solids:recrystallization and melting points) experiment?

A: What is the aim of (solids:recrystallization and melting points) experiment?

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: In the second paragraph you should define and describe the process of gas chromatography. In this…

A: A diluted sample in used in gas chromatography because this helps in establishing a proper…

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: What is the difference between gel filtration and gel permeation?

A: Gel Filtration Chromatography is a technique which use to sperate out the molecules by there the…

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

A: The unknown solution contains liquid and impurities.

Q: Filter paper is usually a poor material on which to powder a solid sample before introducing it…

A: Filter paper is not used as material on which substance can be powdered before its addition into…

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: why do we have to order samples (from least concentrated -most concentrated) when measuring the…

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