5. Why is it important that your glassware be dry for Part 2? Postulate as to what would have happened (i.e. how would your results have differed) if you had used water as your solvent in Part 2?
Q: c) You decide to use ethanol in conjunction with another solvent to make a solvent pair. What two…
A: CRYSTALLIZATION: A process in which solid crystals are produced from other state of matter like…
Q: Which one answer does NOT represent a characteristic of a good recrystalli solvent? 1) Should not…
A: Recrystallization is the process of purification of an impure substance by the use of a suitable…
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: While recrystallizing, what should you do if you have solid particles that don’t dissolve even after…
A: a) If the solid particles are not dissolving in the solvent even upon adding the hot solvent, then…
Q: Imagine your original mixture had contained a component capable of sublimation, such as naphthalene.…
A:
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: 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: If you are performing a solvent extraction using 1M NaHCO3 and Dichloromethane (Density = 1.325…
A: Solvent extraction is a process of separating the dissolved compound from one solvent by using…
Q: Sometimes, the melting point range of a sample does not correspond exactly to that recorded in the…
A: Definition: The melting point of solid is defined as the temperature at which the solid exists in…
Q: 4. The reflux set-up in the experiment allows prolonged heating of the liquid reactants for them to…
A: In organic chemistry experiment, reflux technique is used used to obtain the product in chemical…
Q: Why is the final product from recrystallization isolated by vacuum filtration and not by gravity…
A:
Q: Re: recrystallization Before packing into a capillary tube, a solid substance has to be powdered.…
A: Watch glass
Q: Assume there is confusion as to the nature of a liquid that is being distilled off from 1,4…
A:
Q: Why is the washing of crystals on the filter paper not as effective a process of purification as…
A: Since there are multiple questions, we will answer only the first one. If you require the answers to…
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: Q2. What does “crude” product mean? Q3. What is the advantage of using Buchner filtration in…
A: “Since there are multiple questions and it is not mentioned that which one has to be solved so I am…
Q: 4. What is the purpose of changing the eluting solvent from pentane to ether between the two…
A: "Since there are multiple questions and it is not mentioned that which one has to be solved so I am…
Q: Based on your results, how does rate of crystal growth effect the purity of a recrystallized…
A: When the crystals of any compound are impure due to any reason. They can be recrystallized by the…
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: 1.What is the purpose of washing the recrystallized solid with solvent during the vacuum filtration…
A: A question based on purification, which is to be accomplished.
Q: What do the melting points of the 6 samples tell you about their relative purities?
A: Melting point is the temperature at which equilibrium exist between solid and liquid phases. The…
Q: If we are recrystallizing a PURE compound, what will happen to the sample if we cool the solution…
A:
Q: What are you looking for specifically when doing the microscale boiling point? What causes the…
A: A liquid boils when its vapour pressure equals to the atmospheric pressure. Boiling point of a…
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: 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: When performing arecrystallization, slocent with a boiling point less must be use than the melting…
A:
Q: You are tasked with performing a recrystallization. You have 3 potential solvents to use, but you…
A: The solution is given below -
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A: Chlorophyll is a fat soluble hydrophobic compound. Methanol is hydrophobic solvent. Methanol is a…
Q: Why might it be necessary to pretreat a sample you are working with before running your laboratory…
A: Please find your solution below : In chemistry, sample preparation or the pretreatment of a sample…
Q: If fine sand were an impurity in a sample, how would it effect the melting point? What would make…
A: Melting point of a substance is the temperature at which its solid phase and vapour phase exists in…
Q: While performing the Dumas experiment, if the outside of the flask were not completely dry (Part I),…
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: 2. Is it possible to purify a compound by recrystallization using a mixture of solvents? Why or why…
A:
Q: In recrystallization, crystals gathered are washed with cold solvent. What would its effect on…
A: When a reaction is carried out, the product obtained is mostly accompanied by some other substance…
Q: Which oil - olive oil or coconut oil - would you expect to have a higher peroxide value after…
A: The peroxide value indicates the amount of peroxide generated in an oil sample by exposure to…
Q: what is the purpose of steam distillation? and what are the factors involved ?
A: Steam distillation is a separation process which purifies isolate temperature-sensitive materials,…
Q: Student A did not see any spots on her TLC plate after visualization under iodine vapor. Which of…
A: Thin layer chromatography
Q: 5. For the same solid compound as the question above, if the 1 mm sample was heated at 60° per…
A: (4) Heating rate = Temperature/time Heating rate = 200 oC/1 oC/min Heating rate = 200 min (5) 1 mm…
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: 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: 1. Why should the line of the bottom of the paper be drawn on a pencil? 2. What would happen if the…
A: Concepts of Thin Layer Chromatography.
Q: 1. Pure compounds have higher (and sharper) melting points than compounds that contain impurities.…
A: Melting point depends on the intermolecular forces of attraction to a greater extent. Pure crystal…
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: When steam distillation is not recommended? What is the theory of steam distillation technique?
A: There are various solutions which contains a lot of solvents which needs to be separated out from…
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.
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- Chemical amusement. Fire without matches In a watch glass take few crystals of KMnO4+Conc.H2SO4, held cotton dipped in acetone or alcohol or ether with a tong, fire catches immediately .why?. Give reason (explaain in detail)5 g of cobalt carbonate and 13 mL of concentrated hydrochloric acid were used. In another glass, prepare a solution with 8.4 mL of anhydrous ethylenediamine and 2.8 mL of concentrated hydrochloric acid. They are mixed and added and 6.5 mL of peroxide were added to it.30% hydrogen, thenconcentrated hydrochloric acid is added, followed by60 mL of ethanol. 5.1234 g were obtained orange solid [Co (en) 3] Cl3 What is the percentage yield of the reaction. The reactions are shown in the images.What is the advantage of using Buchner filtration in filtering crystals? Q4. Briefly explain how scratching the wall of the glass flask can help formation of crystals.
- Which of the three methods, (Use of Separatory Funnel, Decantation or Use of Pasteur Pipette) do you believe is most suitable for transferring large volumes of liquid mixtures and why?3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.What is the function of a desiccant in a set-up of volatilization gravimetry? To remove nitrogen from the sample To remove sulfuric acid from the sample To remove water vapor from the sample To remove carbon dioxide from the sample
- Give the advantages of using steam distillation in the recovery of an inorganic liquid from a mixture.For this statement, answer True or False and explain your answer briefly. Polarity is the only characteristic used in liquid-liquid extraction to isolate a poison from the biological matrix.Defi ne moist and dry heat, and explain their modes of action and relative eff ectiveness.
- Q4. What is the immiscibility gap for a glass meh? Schematically expkin the spinodal decomposition of the said glass meh. Q5. What are the sources of flaws in gass? A material having a modukus of 10" N/m and a fracture surface energy of 2 J/m has a pristine strength of 40 GN/m. What is the interatomic distance in this material? What is the critical crack length for a material having a modulus of 100 GN/m and surface energy of 3 J/m if the failure stress is found to be 10,000 psi?You are given a 1:1 (by weight) solid mixture of vitamin C and vitamin A, and you are going to use liquid-liquid extraction to separate one from the other (chemical structures are given below). If you decide to use water (density, 1 g/mL) and ethanol (density, 0.789 g/mL) as your extraction solvents, will this separation be successful? Why or why not? он HO HO. HO HO Vitamin C (ascorbic acid) Vitamin A (retinol)-T-4 A B C 2. The TLC plate (left) shows three lanes; the lower dotted line is where the original spots were made and the upper dotted line is the solvent front. You may assume that the solvent was non-polar and the TLC material was silica. Explain, using intermolecular forces, to describe what's happening in all three lanes (A, B and C). Hint: Start with the question: "Which lane shows the more polar substance?"