For this experiment, yield was not important, but in onsite lab, as well as large-scale processes, a good yield is crucial in the success of a purification step. In what ways do you think a high yield can be assured in recrystallization?
Q: In vacuum filtration, the filter paper should be wet before the final product solution is poured…
A: In vacuum filtration, the filter paper should be wet before the final product solution is poured…
Q: What is the purpose of a brine wash (saturated sodium chloride solution) in a liquid/liquid…
A: We have to predict the purpose of brine washing.
Q: For a two-solvent recrystallization, you should have one solvent (solvent # 1) in which your desired…
A: In the process of crystallization first the solid compound is dissolved (In solvent 1) at boiling…
Q: Below is a chromatogram observed from chemical separation of chlorinated pesticides using gas…
A: Gas chromatography is an analytical technique used for the separation of chemical components of a…
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: . In the solution step, an unnecessarily large volume of solvent is used. i. Effect on…
A: Recrystallization is the purification technique. In this technique, the hot solvent is used to…
Q: 2-propanol and water are mixed in three different ratios in this experiment to test the effects of…
A: 1.) The ratio of given for propanol/H2O is 2:3 so we can assume the volume of propanol is 2x and…
Q: Phena Cetin 80 75 70 65 60 55 45 40 35 30 25 4000 3500 3000 2500 2000 1500 1000 500 Wavenumbers…
A: We have find out formation of phenacetin.
Q: Imagine your original mixture had contained a component capable of sublimation, such as naphthalene.…
A:
Q: Suppose we start with 3.0g of contaminated benzoic acid. After recrystallisation we end up with 2.3g…
A: Given Mass of contaminated benzoic acid = 3.0 g Mass of pure benzoic acid = 2.3g
Q: Are the ammonia distillation and the AAS a macroanalysis or a microanalysis? In which analysis is…
A: Analytical chemistry involves the quantitative and qualitative analysis of substances. Macro…
Q: Remember how you learned that a pure liquid distills within a narrow boiling point range, but that a…
A:
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: A scientist wishes to measure the concentration of methyl benzoate in a plant stream by gas…
A: We are given for peak A of methyl benzoate of 1.37 mg/ml gave an area of 301, and peak B of butyl…
Q: Vitamin C Analysis, a student accidentally puts 1.0 g of sodium bicarbonate (NaHCO3) solid into the…
A: The sodium bicarbonate (NaHCO3) solid is a base which neutralises the acid in the reaction. Hence it…
Q: If you did not completely dry the Erlenmeyer flask before weighing the result, how would that affect…
A: Given : You did not completely dry the Erlenmeyer flask before weighing the result.
Q: Write the equations for the acid-base reactions involved in this experiment. Clearly show the…
A: Introduction: Extraction and filtration of an organic mixture are done on the basis of the…
Q: 1.) Would recrystallization work if you more impurity than product and both were soluble in the…
A:
Q: A student doing this experiment had some problems with the procedure, as described below. Explain…
A: On reaction of magnesium and hydrochloric acid, magnesium chloride and hydrogen gas is produced. The…
Q: If you inject your sample into the Gas Chromatography and wait several minutes but there is no peak…
A: Hello. Since multiple questions have been posted, the first question shall only be answered in this…
Q: A student trying to determine if a white solid is a true hydrate heats the sample and finds that…
A: Salt hydrates are salts that have a water molecule in their crystal. When you heat a hydrate, you…
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: Use what you know about solubility, chemical kinetics, reaction rates, and how extractions works to…
A: Coffee consists of 2-3% caffeine, 3-5% tannin, 13% proteins, carbohydrates and 10-15% oil. The…
Q: What could have gone wrong in the separation and purification process to result in the disparity…
A: According to option A if benzoic acid and sand are weighted in wrong way then it is very possible…
Q: Draw an HPLC instrument diagram by writing the name of the parts. Define the isocratic and gradient…
A: The analytical method that deals with the separation of the components based on the difference in…
Q: In this experiment, you will be performing TLC on your 'crude' and 'recrystallized' biphenyl…
A: In the above experiment, TLC of crude and recrystalline biphenyl Is performed. In crude products…
Q: Gestation time arrangement of Hegran, Hexanol, and Benzene compounds in the reverse phase of column…
A: A question based on analytical process that is to be accomplished.
Q: 0.02 kg plant extract in 2dm3 of water was shaken with 0.1dm3 ether. Upon checking, 1.7x10-3 kg of…
A: Mass of plant extract = 0.02 kg
Q: Imagine you are an organic chemistry student who isolates a crude sample of salicylic acid following…
A: The melting point is largely dependent on the impurities present in the substance. If there are…
Q: In the multistep reaction, a bromine in acetic acid solution was used that contained 0.15mL of…
A: A bromine in acetic acid solution was used that contained 0.15mL of bromine in 0.3mL of acetic acid.…
Q: f an instrument gives a response of 1240 for a standard containing 8 ppm of a substance, how much if…
A: The given question can be solved by using the unitary method. The assumption that we are taking is-…
Q: Jamar spotted the three (3) component mixture shown below to a TLC plate and developed it using the…
A:
Q: 1.Each of the student statements below is wrong. You will need to explain why they are not correct.…
A: There are some of the common tricks associated with recrystallization to get a relatively pure…
Q: Make a results and discussion in Laboratory Report Format of the following: 1. Separation of…
A: As per our Company guidelines, we are supposed to answer only first three sub-parts. Kindly repost…
Q: A yellow compound, dissolved in methylene chloride, is added to a chromatography column. The elution…
A: Chromatography is a laboratory method for the isolation of a mixture. In a fluid called the mobile…
Q: (Submit your answers on a separate sheet if necessary.) 1. If some of your unknown sample failed to…
A: These Questions are related to the effect of the error on experimental data calculation.
Q: A countercurrent extraction cascade is used to extract acetone (A) from its mixture with water by…
A: Given, countercurrent extraction cascade is used to extract acetone (A) from its mixture with water…
Q: Chemistry Two unknown compounds A and B with the chemical structures below are separated on a…
A: Chromatography is the technique which is used to do the separation of components from the…
Q: A student recrystallized some impure benzoic acid and isolated it by filtration. He scraped the…
A: Recrystallization can be defined as the process in which old arrangement of particles in the crystal…
Q: For numbers 1-3, refer to TLC plates below, (A,B and C, from left to right) M M M H H K Sample…
A: Given that, the reaction is Hamtori (H) and Kotetsu (K) react to form Matetsu (M),i.e., H + K → M.…
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: A student forgot to add the mass of the unknown solute in trial 1 to the mass of the solute that was…
A: Mass = ( m1+m2 ) divided by 2
Q: You are monitoring the reaction A --> B via periodic GC analysis. Initially, you only see one peak…
A: Gas chromatograpy is an important tool to monitor chemical reactions.
Q: Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7…
A: As you have posted two independent questions in a single request, we will solve the first question…
Q: One of the main differences between TLC and column chromatography is the direction in which the…
A: Purification is one of the key step in the isolation of organic or inorganic compounds. Different…
Q: We used tab water to extract caffeine from tea instead of using distilled water. How does it affect…
A:
Q: For this chemistry problem, I am stuck on what the reactants and products are in order to determine…
A: (a)Product A is Cu(NO3)2 and it reacts with NaOH giving Cu(OH)2. The reaction between Cu(NO3)2 and…
Q: i need help calculating the therotical yield based on the data in the lab and please show me the…
A:
Q: Data Sheet with Sample Results Note: results that require calculations are purposely left blank and…
A: (7) Mass of NaCl dissolved : Mass of NaCl dissolved = (Mass of 50mL beaker + Stirring bar + NaCl) -…
Q: Based on TLC, how can you tell if the reaction is complete and what is the relevvance of the…
A: Answer: TLC- TLC (This layer chromatography) is the separation technique used to determine the…
Q: The procedure uses 20 mLs of cyclohexanol. How many moles is this? SHOW YOUR WORK. What is the…
A: Given data,Volume of cyclohexanol=20mLMolar mass of cyclohexanol=100.158g/mol
Q: reparation of 0.25N NaOH Objective: Apparatus and Materials: Procedure : Calculate the exact mass…
A: 0.25N NaOH 1 litre N stands for normality To prepare normal solution, we take gram equivalent weight…
Q: You used a mobile phase of 90% ethyl acetate (CH3CH2COOCH3)/5% acetic acid (CH3CO2H) as the mobile…
A: And is option C All the compounds would have travelled further up the plate.
Step by step
Solved in 2 steps with 1 images
- Stoichiometry: Prolonged exposure of some functionalities to the eluent (methanol) in this experiment may lead to undesirable reactions. In one case, Acetylsalicylic acid (Aspirin) can react with methanol to form salicylic acid and methyl acetate. If 800 mg of Acetylsalicylic acid and 1 mL of Methanol undergoes such a side reaction (known as "Methanolysis") to completion: (a) write a balanced equation (draw all molecules instead of writing chemical formulas), (b) what is the limiting reagent? (c) predict the grams of salicylic acid and methyl acetate to be produced in this process. Show calculations. Hint: you can determine the grams of 1 mL of Methanol through its density.Often, palnters mix blue and white palnt to lighten Its color. Which of the following statements below are true regarding how the presence of two pigments In a single unknown solutlon would affect the results of your experiment? O With two cations in solution, both cations can potentially react with the chosen test. O if there are two different results/ppt/color changes, there could be interference, making the identification very difficult. O For any available test that has two matching or simlar results, multiple tests will need to be performed in order to identify both pigments correctly O The two cations can react with each other to form a precipitate. Therefore, the cations are no longer available to react with the reagent added for a particular test making it very difficult, it not impossible, to identify the cations.What kind of sample cleanup does solid-phase extraction accomplish in the analysis of caffeine and theobromine in chocolate?
- Hazards of this experiment include Melting point apparatuses that will be very hot Reagents that may be toxic and/or irritate skin and eyes Glass capillaries and thermometers 4. All of theseA student rushed through this experiment. Describe the effect that the following procedural changes would have on the percent recovery of acetanilide. Briefly explain the basis of each answer.(a) Rather than adding 0.5-mL portions of boiling solvent to the acetanilide, the student added 5-mL portions of boiling solvent.(b) The student did not pre-heat the gravity filtration apparatus.(c) The student forgot to cool 5 mL of solvent in Part 5 and washed the crystals with room-temperature solvent.10. Fractional Distillation: This lab was viewed via a video and described in detail in lab class. You are distilling apart hexane (bp = 68) and toluene (bp 110). Your boiling point for the first fraction is 48°C. Why is the boiling point so low (most likely reason)? !! azeotrope with water non-resonance of hexane O resonance of toluene student error O seriously impaired thermometer
- Topic: Isolation of Crude Ovalbumin from Egg White by Ammonium Sulfate Precipitation(Salting Out) After filtration, 30.0 mL of the filtrate was obtained, and the solution was brought from 0% to 40% saturation by adding the required amount of powdered ammonium sulfate, (NH4)2SO4. Why is there a need to gradually add the ammonium sulfate to the sample?19. What is thin layer chromatography (TLC) LEAST useful for from the list below? A) To determine if crystallization or distillation may be more effective for a separation B) To determine the number of components in a mixture C) To determine the appropriate solvent for column- chromatographic separation D) To monitor the progress of an organic synthesis reaction 14. The solubility of salicylic acid in water is 7.8g/100ml at 100°C and 0.25g/100ml at 25°. Estimate how much water is needed to recrystallize a 19g sample of salicylic acid? A) 150ml B) 250ml C) 300ml D) 400mlWhy is strict implementation of LQMS (Laboratory Quality Management System) or GLP is necessary ? What are the elements ?
- PART1: Put True (T) or False (F) for the following sentences: 1. chromatography" derived from two Greek words "Chroma" meaning color and "graphein" meaning to write. The stationary phase may be a solid, or a liquid supported on a solid or gel. 3. The mobile phase may be 2. Solid. 4. Silica gel is the most common stationary phase in adsorption chromatography. 5. Liquid Chromatography abbreviated as (GC ). 6. In Thin Layer Chromatography, the mobile phase is gas. 7. a = KB/KA, where Kg is the distribution constant. 8. k'B and k'A are the retention factors. 9. Rf, is the distance traveled by the compound ONLY. 10. Chromatography is a physical method of separation.Column Chromatography of 9-Fluorenone Experiment Introduction: Column chromatography is an important chromatography method used to separate and purify organic compounds. Column chromatography is typically used to separate impurities and purify products from chemical reactions, including separating unused starting material from products. Column chromatography is very similar to Thin Layer Chromatography (TLC) because it relies on a solid stationary phase (absorbent) and liquid mobile phase (eluant) to separate organic compounds based on their different polarities. In column chromatography, the stationary phase is a solid absorbent, typically silica gel or alumina, with a liquid coating packed into a glass column. The stationary phase is typically very polar. An eluant (mobile phase) solvent travels down the column and the separation occurs as the organic compounds enter into equilibria with the stationary and mobile phases. The polarity of the eluant may be adjusted from non-polar…Which statement about the determination of the percentage purity of benzoic acid is correct? * A- Only sodium hydroxide solution can be used as the titrant in the volumetric analysis of benzoic acid. B- Analysing a benzoic acid sample that still contains some hydrochloric acid may yield an analyte percentage that is less than expected. C- Analysing a wet benzoic acid sample may yield an analyte percentage that is more than expected. D- All these statements are correct. E- None of these statements are correct.