A 25 g organic substance was purified using recrystallization. Amount recovered after recrystallization was 18 g. Determine % purity of the sample (b) If % yield obtained after sublimation process was 60%, how much sample was present if 12 grams of an organic compound was recovered? (c) Determine % impurity from b
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- What is silazation ?kindly help me with this problem thank you ill give like for the answer 3. (a) A 25 g organic Substance was purified using recrystallizabon. Amount recovered after recrystallaabon was 18 g Determine % purity of the sample (b)If % yield obtained after sublimation process was 60%. how much sample was present if 12 grams of an organic compound was recovered? ( c)Determine % impurity from bI want the best value for percent purity and how did you arrive at the best value
- Several steps can be done in preparing samples for analysis with high moisture content except ____________. Group of answer choices The moisture present in the sample is removed before weighing the analytical sample. The analysis is immediately carried out on the wet sample. The moisture content of the sample is determined immediately upon receipt of the sample. The analysis is carried out on the dried sample after the moisture content is determined.What are the a.) source (natural)synthetic of raw materials b.) method of separation/chemical reaction (with brief process) of the raw materials: calcium polysulphide and hydrochloride acid with yield of precipitated sulfur? As also shown in the attached imageAsh was estimated in the sample of hay, and the records were as follows, note that the moisture is 18%. Weight of crucible = 14 g Weight of crucible + sample = 15.2 g Weight of crucible + ash = 14.1 g Calculate: i. Ash percentage according to the fresh material ii. Ash percentage according to the dry matter iii. Organic matter percentage according to the dry matter iv. Organic matter percentage according to the fresh material
- An impure sample of 0.1002 g benzoic acid underwent purification by recrystallization. A mass of 0.0542 g of white solid benzoic acid was obtained. Calculate the % purity of the initial sample. Show calculations and report the result with correct number of significant figures. Hi there please answer all parts clearly and concisely with legible hand writting, thank you!When purifying a sample of aspirin that was produced in the lab, the impure aspirin sample should be dissolved in a very cold solvent, so that solid impurities can be filtered and analyzed the next day or the next week. True or False?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…
- Which of the following statements is true? After drying a sample in the oven, you can place it immediately inside the analytical balance. In weighing hygroscopic substances, containers should always be kept close when not in use. Place solid reagents / precipitates directly on top of the balance pan. Liquids can be weighed using a weighing paper.Which among the variables is NOT part of the distillation process? Polarity Vapor Pressure Temperature Phase interactionA student determined fluoride in a toothpaste sample using ion chromatography. A toothpaste sample of mass 0.100 g was dissolved in type I water and then quantitatively filtered through a Whatman #1 filter paper into a clean 100 ml volumetric flask. The flask was then made up to volume with type I water and mixed thoroughly.A portion of the solution was filtered through a 0.45 um filter into a sample vial for analysis. Analysis of the sample gave a fluoride concentration of 1.60 mg/l Calculate the % w/w fluoride in the original toothpaste sample. (Give your answer to 3 decimal places please)