In vacuum filtration, the filter paper should be wet before the final product solution is poured into the buchner funnel. Explain why such an action should be implemented.
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In vacuum filtration, the filter paper should be wet before the final product solution is poured into the buchner funnel. Explain why such an action should be implemented.
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- Why is recrystallization not applicable to samples which contain large amount of impurities?250 mL of water sample was collected from a river and sent to a laboratory to determine the concentration of the total suspended solid. In the laboratory, 5 mL of the water sample was transferred to a 100 mL volumetric flask before diluted with distilled water to 100 mL. After that, 50 mL of the diluted water sample was transferred to a funnel containing a glass fiber filter and attached to a glass flask with the sidearm connected to a operating vacuum pump. Transferred diluted water sample was left drained through the glass filter before glass fiber was transferred to an oven to heat at 105 oC under a constant weight of 0.2654 g was obtained. If the initial weight of the glass fiber filter is 0.2431 g. Calculate the amount of the suspended solid in mg unit contained in the 250 mL collected water sample.5. In preparation for the analyses of other types of samples that may reach your laboratory, the supervisor tasked you to research different extraction procedures for the analyses of Tetrahydrocannabinol (THC) and other related compounds so that you can purchase different extraction instruments. How will you convince him to buy a Supercritical Fluid Extraction Instrument? C
- The scatter plot below shows the density of ethylene glycol solutions vs. the mass % of those solutions. Density (g/mL) 1.04+ 1.03- 1.02- 1.01 0.99- 0.98- 8 % 10 12 14 16 18 20 Mass % Q The equation for the line of best fit shown on the scatter plot is y= 0.001683 +0.9959. Use the equation of the trendline to determine the mass percent of an ethylene glycol solution with a density of 1.015 g/mL.Volatile and semi-volatile compounds can be analyzed by GCYou are analyzing the effluent from a lotion plant for parabens using HPLC. You have a working standard solution with a concentration of 59.4 ppm which returned a Peak Height of 10,164 and Peak Area of 5,315. You take 44.4 L of the water sample and concentrate it to 0.3 L and analyze this solution. The Peak Height is 9,119 and the Peak Area is 6,320. What is the concentration of parabens in the effluent of the plant in mg/L to two decimal places.
- You are attempting to purify a compound via recrystallization. You prepare the process through the following method: 1) Dissolve the material in a minimal amount of hot EtOH. 2) Slowly add hot water until the compound is slightly cloudy. 3) Add a small amount of EtOH until the solution is just clear (still hot). 4) Cool to RT. Upon cooling to RT you notice that the compound is not precipitating out of solution. You decide to boil off some ethanol. Upon completing this step and cooling to RT you notice that the compound is precipitating out as desired! In which solvent is your compound the least soluble? Ethanol O Water O The ethanol water mixture Insoluble in all of these solventsWhen choosing a pair of solvents for a mixed-solvent recrystallization, what factor is most important? Group of answer choices a)The miscibility of the solvents. b)The similar size/molar mass of the solvents.Pls provide clear solution on B & C 1. The Freons are a class of compounds containing carbon, chlorine, and fluorine. While they have many valuable uses, they have been shown to be responsible for depletion of the ozone in the upper atmosphere. In 1991, two replacement compounds for Freons went into production: HFC 134a (CH₂FCF 3) and HCFC-124 (CHCIFCF 3). to a. Calculate the molar masses of these two compounds(CH₂FCF3 and CHCIFCF 3). b. What is the percent composition of CH₂FCF 3? c. What is the percentage of Chlorine present in CHCIFCF 3.
- Select the phenomenon that is being described by each statement a. Breaking b. Agglomeration c. Coalescence d. Ostwald ripening e. Creaming f. Aggregation g. Flocculation Which observes the clustering of individual dispersed droplets? Which observes the separation of phases due to the fusion of globules? Which annihilates the film surrounding the particles in an emulsion? Which process is described as the coming together of particles? Which causes the rise of dispersed particles to the surface of an emulsion? What process is described as the deposition of small particles on larger particles? Which observes the quick separation of the two liquids to their original state?True or false. Give a motivation for your answer. Cation concentration in thesoil solution decreases with distance from the clay particle with a net negativecharge.The standard addition method is used to analyze a sample of a river water for mercury. Solution A is made by pipetting 5.00 mL of undiluted sample in to a 10 mL volumetric flask and filling to the mark with D water. Solution B is made by pipetting 5.00 mL of undiluted sample and 3.00 mL of 15.0 ppb of Hg standard into same 10.0 mL volumetric flask and filling to the mark with DI. Solution A and B are analyzed using atomic absorption spectroscopy and give a percent transmittance values of 56 % and 33 % respectively (not blank corrected). A blank has a transmittance of 96%. Which of the following technique can be used to determine the amount of mercury in the undiluted sample of river water? O A. IR spectroscopy O B. Cold vapor atomic absorption OC. Hydride generation atomic absorption OD. Electrothermal atomic absorption