During recrystallization, an orange solution of a compound in hot alcohol was treated with activated carbon and then filtered through fluted paper. On cooling, the filtrate gave gray crystals, although the compound was reported to be colorless. Explain why the crystals were gray and describe steps that you would take to obtain a colorless product.
Q: Why would a solvent with a very high boiling point be inappropriate for a recrystallization?…
A: There are some ideal conditions in selecting the solvent for crystallization. Among which the…
Q: The white solid that remains in the centrifuge tube after acetone extraction fizzes when…
A:
Q: The liquid-liquid extraction is the classical technique in chemistry to isolate a target component…
A: Liquid-liquid extraction is also known as solvent extraction in which compounds are separated based…
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: Describe in words and by means of complete chemical equations, how a mixture of 1.25 g of benzoic…
A: Liquid- liquid extraction: This method is used to separate the mixture of two compounds according to…
Q: During recrystallization, an orange solution of a compound in hot water was treated with activated…
A:
Q: 1-There are many opportunities during a recrystallization to lose crystals. How could you improve…
A: Since you have posted multiple questions, we are solving only first question for you. If you want…
Q: you've been tasked to compound 30 grams of a 0.5% Zinc oxide ointment. you have a stock preparation…
A: The formula used to calculate the amount need to be dilute is as follows: Amount need to be dilute =…
Q: In the preparation of acetylsalicyclic acid, the crude crystals can be recrystallized with an…
A: Our correct answer is True.
Q: Explain and elaborat
A: Organic compounds when obtained from their natural sources or prepared in the laboratary are…
Q: The substance to be analyzed – is white, highly soluble in water salt. Flame coloration test gives…
A: Salt can be identify from different analytical method
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: Write the balancing equations for C,H, and O.:)
A: Since you have asked multiple questions, we will solve first one for you. For remaining question…
Q: How was the precipitate obtained after filtration? a. By drying the precipitate on the filter paper…
A: The precipitate is obtained by drying the precipitate on the filter paper using a desiccator.
Q: After a crude product is dissolved in 1.5 mL of hot solvent, the resulting solution is dark brown.…
A: Activated charcoal can be extracted colored impurities from the solution. But the quantity to be…
Q: why does the observed meltin point change over the course of distillation
A: Distillation is the process of heating of liquid until it boils then condensing and collecting the…
Q: The authenticity of sodium nitrite and the presence of impurities of nitrites and nitrates in…
A: Chemical test for the presence of the nitrate and nitrite ions.
Q: Which solvent would be the best choice for use as an extraction solvent in a separatory funnel with…
A: The best choice as an extraction solvent with aqueous solution of NaHCO3 followed by Rota…
Q: Calculate the saturation indices of the solutions describe below and classify each as…
A: The solution can be classified as under-saturated, supersaturate or in equilibrium as per the below…
Q: Which method would be most appropriate for the purification of an off-color crystalline compound? A.…
A: Introduction: Purification is the process of obtaining pure compounds by removing unwanted…
Q: What are the important solubility characteristics for a solvent for crystallization of an organic…
A: Compounds that are formed form organic synthesis are generally impure and requires purification.…
Q: Explain melting point determination as a characterization technique.
A:
Q: Describe the preparation of 1100 mL of 6.00 M HNO, from the commercial reagent that is 91% HNO3(w/w)…
A: The volume of the required solution is = 1100 mL The molarity of the required solution is = 6.00 M…
Q: Write the principle behind the following methods of refining :(i) Hydraulic washing(ii) Vapour phase…
A: The principle behind these processes are, (i) Hydraulic Washing: This method is based on the…
Q: A student recrystallized some impure benzoic acid and isolated it by filtration. He scraped the…
A: Re-crystallization is the most commonly used technique for purifying a solid compound. In the…
Q: Write the balancing equations for C,H, and O.: 1. Assume a certain extraction has a distribution…
A: Since you have asked multiple questions, we will solve first one for you. For remaining question…
Q: 1. The surface of silica gel has a structure shown in the diagram below : ОН OH ОН -0- Si - 0- Si-…
A: As given in the question; let us draw the plate before putting into the solvent (acetone) chamber:…
Q: Write a flow diagram Prepare a written copy of the complete separation scheme for a solution that…
A: The complete separation scheme for a solution that contains Ag+, Fe3+, Cr3+, Ni2+, Zn2+and Ba2+ is…
Q: In gravimetric analysis, volatile solvents are used _______.
A: gravimetry The analyte is converted to a sparingly soluble derivative so that it can get…
Q: What happens if the solvent concentration falls below that of the silica stationary phase? What is…
A: The chromatography technique consists of two phases mobile and stationary phase .Mobile phase is the…
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: Describe how an emulsion could break down in case it forms in an acid-base extraction or in general.
A: Emulsion is a colloidal dispersion in which both the dispersed phase and dispersed medium are…
Q: On being heated, the fullerene solvate C60 xCHBr3 loses solvent in a two-step process. The final…
A: molecular mass of the solvate ;=[60×12.0+x{12+1+(79.9×3)}] g/mol=720+x(13+239.7) g/mol=252.7…
Q: Why is the mixture extracted with sodium bicarbonate? Give an equation and explain its relevance.
A: Extraction is a chemical technique used for the separation of a substance from a matrix. The three…
Q: A student trying to determine if a white solid is a true hydrate heats the sample and finds that…
A: The explanation is about true hydrate or not given below.
Q: 6.0 mL of cyclohexanol, 8 mL of 85% phosphoric acid, and 10 drops of sulfuric acid are added to a…
A: The percentage yield can be calculated by the formula = Actual yield x 100 /theoretical yield
Q: In a recrystallisation, why are the newly formed crystals washed with cold solvent? -To wash off any…
A: Recrystallization is the technique that is used to purify solids. The basic principle is to dissolve…
Q: Which of the following would LOWER the purity of the distillate collected from the rubbing alcohol…
A: General chemistry
Q: What is the main information you wish to acquire when performing a melting point analysis? A) the…
A: Melting point analysis is always done to check the purity of our compound obtained during the…
Q: Provide a complete and detailed separation scheme for the following compounds, you have the…
A:
Q: Prepare a written copy of the complete separation scheme for a solution that contains Ag+, Fe3+,…
A:
Q: You are attempting to purify a compound via recrystallization. You prepare the process through the…
A: Least solubility of the compound means that it would get precipitated in that solvent. So we would…
Q: Upon this addition of potassium chromate, you observe no formation of precipitate. Which of the…
A: Pb2+, Ag+, and Hg22+ give a white precipitate with HCl. So the formation of white precipitate with…
Q: Analyze the effects caused by various impurities on precipitate during the gravimetric analysis and…
A: Gravimetric analysis is one of the techniques in which the amount of a particular component of an…
Q: Draw a five-step Schematic diagram of the procedure on how to separate pure crystals of CuSO4 , Alum…
A: Answer - CuSO4 - Copper(II) sulfate, also known as copper sulphate, are the inorganic compounds…
Q: involved Deasphalting, Visbreaking, Hydrocracking, Fluid Coking, Production of high-quality gasoline…
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: Explain the reasons for the importance of crystallization step involved in the manufacturing of bulk…
A: Crystallization is the process that leads to the formation of a well organized and rigid structure…
During recrystallization, an orange solution of a compound in hot alcohol was treated with activated carbon and then filtered through fluted paper. On cooling, the filtrate gave gray crystals, although the compound was reported to be colorless. Explain why the crystals were gray and describe steps that you would take to obtain a colorless product.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- A researcher reconstituted a vial of 750 mg Cefuroxime Sodium Powder for Injection with 6mL of sterile water for injection. The reconstituted solution was dark amber-colored solution. The package insert states that solution colors range from clear to yellow depending on concentration, diluent, and storage conditions. The researcher was then hesitant to give the patient the solution due to its unusual dark color. Five portions were taken from a batch of cefuroxime sodium. Prior to testing in the instrument, each part was subjected to one of the following conditions: Conditions Specifications Temperature Portion 1: 8°C ± 2°C Portion 2: 30°C ± 2°C Portion 3: 40°C ± 2°C Light Portion 4: Kept in the dark Portion 5: Exposed to direct sunlight 1. Of the several solutions prepared, which absorbance value results should be compared with each other to answer the questions of the pharmacist? Explain your answer.A 50-mL solution of 0.5005 N standard NaOH was added to a 0.9250-g sample of Aspirin and was boiled for 10 minutes. After cooling a full pipet of phenolphthalein was added to the solution before it was titrated with 24.7 mL of 0.5015 N standard HCl solution until the disappearance of the pink color. The same procedure was carried using a blank which consumed 4.6 mL of the same standard acid. Calculate for the %Aspirin in the sample. Atom weights: C =12, H =1, O =16.A forensic chemist is given a white powder by the investigator of a crime scene. The investigator wants to know if the powder is a pure substance or a mixture. The chemist dissolves some of the powder in deionized water making a clear solution. She finds that a precipitate forms when she adds an excess aqueous solution of sodium chloride. She filters the precipitate and washes it several times with deionized water. To this filtrate she then adds an aqueous solution of sodium carbonate. A precipitate forms. Question: Draw two pictures representing a molecular / atomic / ionic view of what occurred when a precipitate formed with the addition of sodium chloride solution. Choose the type of particle that is the most appropriate for this reaction. Place charges on any ions indicating charge values (+1, -2, etc.) when they are known. If charges are unknown indicate whether the ion is positive or negative. Clearly indicate which picture represents before the reaction occurs. Should…
- X ray films consist of a flexible plastic base coated in a gel that contains light sensitive silver halide crystals (i.e. silver bromide and silver chloride). these films are exposed to X ray radiation to produce images of the inside of a subject. Once the films are no longer needed, it is common practice to recycle the film to recover the silver. This process is done by shutting the film and placing it in a large cyanide solution bath. The silver is precipitated out as silver cyanide. a. What can you conclude about the water solubility of silver cyanide? b. Using the knowledge of limiting reactants, how can the process of be optimized to ensure that the maximum amount of silver is recovered?1. A sample of freshly precipitated silver chloride weighs 704.7 mg. Before the solution can be filtered and washed, 10.0 mg of AgCl is photodecomposed. After the precipitate is filtered and washed, another 10.0 mg of AgCl is photodecomposed. Calculate the weight of the precipitate.A phamacist reconstituted a vial of 750 mg Cefuroxime Sodium Powder for Injection with 6mL of sterile water for injection. The reconstituted solution was dark amber-colored solution. The package insert states that solution colors range from clear to yellow depending on concentration, diluent, and storage conditions. The pharmacist was then hesitant to give the patient the solution due to its unusual dark color. Five portions were taken from a batch of cefuroxime sodium. Prior to testing in the instrument, each part was subjected to one of the following conditions: Conditions Specifications Temperature Portion 1: 8°C ± 2°C Portion 2: 30°C ± 2°C Portion 3: 40°C ± 2°C Light Portion 4: Kept in the dark Portion 5: Exposed to direct sunlight a. Which form of the product – the powder for injection, the reconstituted product, or both – will you subject to the following conditions and why? b. Will you also expose the reference standard of cefuroxime sodium to the same…
- 5.0 mL of 1-butanol was mixed with 10 mL of HCl. The reaction was put on an ice bath and 4 mL of concentrated sulfuric acid was added. This mixture was refluxed for 45 min and then the product was co-distilled with water using a simple distillation apparatus. Water and the product are immiscible. 1-butanol has a molar mass of 74.12 g/mol, a density of 0.810 g/mL, and a boiling point of 118 C. The product has a molar mass of 92.57 g/mol, a density of 0.880 g/mL, and a boiling point of 78 C. What is the nucleophile in this reaction? What is the role of H2SO4 in this reaction? Calculate the theoretical yield for this reaction. Give your answer in grams. Select the following statements that can be said about the reaction shown.What is precipitation from homogeneous solution; what are the benefits of this method.Draw a schematic diagram using this information. Preparation of the solution Take about 25-30 ml of distilled water in a beaker and add powdered crude copper sulphate while stirring the solution so that the powder dissolves. Keep adding the powdered sample till a little of it remains undissolved, even if it is stirred thoroughly. Now add 2-3 ml of dil. H2SO4 to make the solution clear. This prevents the hydrolysis of copper sulphate. Filtration of the solution Take a funnel and fix a filter paper in it and clamp it to a stand. Place a china dish under the funnel. The stem of the funnel should touch the wall of the china dish to avoid the solution splashing out. Pour the solution into the funnel over a glass rod and collect the filtrate in a china dish. The insoluble impurities are left in the filter paper as residue. Concentration of the filtrate to crystallisation point Heat the china dish on a sand bath till the solution is reduced to about one-third of its original volume. To…
- Q1)a) In the gravimetric analysis the precipitate should be free from impurities. Give the detailed justification for the above statement by identifying impurities. b) It is required to analyse the metal from its ore sample. Manganese (Mn)present in the ore sample was analysed by forming a precipitate of MnSO4. If 2.98 g of ore sample gives 0.19 g of MnSO4. Calculate the percentage of Mn present in the sample.Analyze the table of some common inorganic precipitating agents and answer the following questions: Zn and Sn ions coprecipitate when they exist in solution to form mixed oxides. Suggest a precipitating agent that precipitate one of the oxides a. only A silver chloride precipitate is precipitated in gravimetric analysis. Which solution would you recommend to wash the precipitate: AGNO3 or HNO3. Justify your answer. b. Precipitating Element precipitated agent NH3(aq) Be (BeO), Al (A12O3), Sc(Sc203), Cr (Cr203), Fe (Fe203) Ga (Ga2O3), Zr (Zr02), In (In2O3), Sn (SnO2), U (U3O8) H2S Cu (CuO), Zn (ZnO or Zn2O4), Ge (GeO), As (As203 or As205), Mo (Mo03), Sn (SnO2), Sb (Sb2O3 or Sb2O5) (NH4)2S Hg (HgS), Co (Co304) (NH4);HPO4 Mg (Mg2P2O7), Al (AIPO4), Mn (Mn2P2O7), Zn (Zn2P2O7), Zr (Z12P207), Cd (Cd2P207), Bi (BİP04) H2SO4 Li, Mn, Sr, Cd, Pb, Ba (all as sulfates) H;C¿O4 Ca (СаО), Sr (SrO), Th (ThО2) HCI Ag (AgCl), Hg (Hg2C12), Na (NaCl), Si (SiO2) AGNO3 CI (A£CI), Br (AgBr), I (Agl) (NH4);CO3…Consider the following scenario: You obtain an Unknown Sample from the Stockroom. You begin testing the solution through the steps outlined in the flowchart of the experiment’s PDF file. You first add HCl and centrifuge your mixture. You observe the formation of a white precipitate in the bottom of the test tube. After pouring off the supernatant liquid, you add hot water to the white precipitate. Addition of the hot water dissolves some of the precipitate, but some white precipitate still remains on the bottom of the test tube. You pour off the supernatant liquid, and add ammonia (NH3) to the remaining precipitate. You now observe the formation of a gray-black precipitate. Which of the following is a valid conclusion to draw at this point? Select one: 1. Hg22+ is definitely present. 2. Pb2+ is definitely present. 3. Ag+ could be present, or Hg22+ could be present, or BOTH could be present. 4. Ag+ is definitely present