In a fractional distillation experiment it is important to wrap insulting tape and Al foil around the length of the fractionating column.  Why do you think this is necessary?

Q: Discuss the purity of Acetanilide before and after crystallization based on melting points. Discuss…

A: The chemical reaction involves the combination of two or more reactants in an appropriate solvent…

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

A:

Q: what would be the implications if the volume reduction is skipped in the recrystallization

A: Recrystallization is a purification technique often employed in the labs. it is based on the…

Q: Why should the solvent not be run off the top of the paper? . What color did you observe in the…

A: Q3)  In paper chromatography, the solvent should not be run off the top of the paper.

Q: In the melting point determination, if the solud is impure, how will it affect the melting point?

A: There are basically 3 state of materials such as solid, liquid and gas. In solis atoms are tightly…

Q: (c) To study the kinetics of iodination of acetone, why starch is used as an indicator just before…

A: Here we are required to provide the reason why starch indicator is not used at the beginning rather…

Q: A melting "point analysis is a bit of a misnomer; how so? What do we measure when doing such an…

A: Melting point analysis helps in analyzing the purity of the compound.

Q: On recrystallization, if the volume reduction step was skipped, what would be the implications?

A: Recrystallization = A purification process, In this process we dissolve a impure solid into a…

Q: Why can’t we use a simple distillation for the solution containing ethyl acetate and butyl acetate?

A: Ethyl acetate, CH3COOC2H5 is a simple ester, with boiling point of 77.1°C while butyl Acetate has…

Q: What characteristics does a mixture need to have so that it could be separated by: A) Distillation,…

A: The separation of mixure on the basis of their physical and chemical properties.

Q: this experiment, yield was not important, but in onsite lab, as well as large-scale processes, a…

A: To answer question 14 and 15.

Q: What is the purpose of NaCl in the experiment? Will the same result be obtained if thereacting…

A:

Q: Why do we use distilled water and not tap water for boiling point elevation experiment?

A: Boiling point elevation occurs when there are dissolved minerals in the water.Distilled water…

Q: It is tempting to maximize the amount of product isolated by continuing the fractional distillation…

A: The solution is given below -

Q: Which is more efficient in separating the components of a liquid mixture, simple or fractional…

A:

Q: Why is it a good idea to perform three trials at each concentration? How would you modify the…

A: Multiple (Minimum of 3) trials in a experiment: When carrying out experiments, it is a nice decision…

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: Data Sheet with Sample Results Note: results that require calculations are purposely left blank and…

A: Solution Mass of NaCl dissolved = (mass of beaker+stirring bar+NaCl)-(mass of beaker+stirring bar) =…

Q: How would the concentration be affected if the etched mark on the volumetric flask is missed and too…

A: The concentration of any substance (solute ) in solution is given by, => Concentratio of solute =…

Q: What are in the distillate collected from the distillation?

A: (1) A receiver

Q: How can we use a known reaction to preform a presumption test

A: Presumption Test :-  Qualitative analysis that allows to identify, or confirm, the presence of a…

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: If insoluble impurities eg. dust, tissues, filter paper etc were mixed with the sample how will…

A: Melting Points:- The melting point of a substance is defined as the temperature at which it melts.…

Q: Why should you know the composition of the weighing form? a. So that it can be washed properly b.…

A: Composition of the compound tells about the mass .

Q: B: Similar to Part A, using 97 mL of an aqueous solution containing 7.22 g of the compound with a KD…

A: w = 7.22 g v = 97 ml portion = 41 KD = 5 n= 2

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: In most distillations, the total volume of liquid obtained (distillate + residue) is not equal to…

A: Given that in most of the distillations, the total volume of the liquid obtained is not equal to the…

Q: 13. How can you induce recrystallization in a solution? a. Scratch inside of beaker with glass rod…

A: The solution is given below -

Q: A melting "point" analysis is a bit of a misnomer: how so? What do we measure when doing such an…

A: By the term melting point, we mean that it is a fixed point of temperature where a substance or…

Q: n paper chromatography,

A: Paper chromatography was discovered by Synge and Martin in the year 1943.

Q: In most distillations, the total volume of liquid obtained (distillate + residue) is not equal to…

A: In most distillations, the total volume of liquid obtained (distillate + residue) is not equal to…

Q: Pinacl-Pinacole lab What visual criterion is to be used to assess whether the crude reaction product…

A: Pinacol pinacol rearrangement is a type of rearrangement which occurs  in geminal diols and…

Q: Calculate the molecular weight from the titration data. What does that suggest about how many nitro…

A: Nitration reaction in a aromatic compound is a electrophilic substitution reaction. Nitro group is a…

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: In glucose estimation using Benedict's Reagent, justify the necessity of continuously heating the…

A:

Q: In extraction process, the solution contains mixture of benzoic acid and sodium chloride and was…

A: Extraction process is a type of process in which when a reaction is completed, sometimes instead of…

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: why is it important to apply the percent volume and percent retrieval in separation of mixtures…

A:

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

A: The solution is given below -

Q: ATION

A: Now, Below are the methods mentioned evaluating the steps,

Q: Why do you need to swirl the flask constantly during the titrimetric analysis? a. To look cool…

A: Titration: It is an analytical method to find out the concentration of a solution with a known…

Q: What are the common faults in the Water distiller instrument?

A: You'll need to clean the boiling chamber on a regular basis to maintain your water distiller running…

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: 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: 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: What properties should ideally be possessed by a recrystallization solvent?

A:

Q: Under what conditions can a good separation be achieved with a simple distillation?

A: Simple distillation is a method of separating two compounds from a mixture on the basis of their…

Q: A fractional distillation of this mixture is carried out: what is the nature of the recovered…

A: Total mass of sample = 80 g Mass of water = 60 g Mass of nitric acid = 80-60 = 20 g number of moles…

Q: for benzoic acid: a.) If a benzoic acid sample had colored impurities, the solvent to choose would…

A: Decolorizing carbon provide a large surface area to which large colored molecules may become…