How can you remove insoluble impurities during a recrystallization? options: 1-Hot gravity filtration. 2- Vacuum filtration 3- It is not possible.You should choose another separation method. 4- Pick out the impurities with tweezers.
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How can you remove insoluble impurities during a recrystallization? options: 1-Hot gravity filtration. 2- Vacuum filtration 3- It is not possible.You should choose another separation method. 4- Pick out the impurities with tweezers.
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- Color BEFORE adding Color AFTER adding Intensity of color AFTER adding FeCl3 Test Tube # FeCl3 FeCl3 #1 (salicylic acid) clear lilac 100% #2 (commercial aspirin A) clear slightly pink 50% #3 (commercial aspirin B) clear lilac 95% #4 (aspirin from your clear pink 20% synthesis above) #5 (control) clear clear 0% Based on this data and the melting point of Aspirin, how pure is the synthesized product?Soil Lab 11a Direct Measurement of Soil Porosity 1. Fill a 100 ml graduated cylinder to the 100 ml mark with tap water. Tilt the beaker containing the soil sąved from Step 3 in the Bulk Density Determination to about a 45 degree angle. Pour the water very slowly onto the soil in the beaker. Stop adding water when the soil pores are filled (saturated) and the soil surface glistens. 2. Allow the soil to stand for several minutes to make sure the water has filled the very small soil pores. Any excess water can be returned to the graduated cylinder. Don't stir or shake the mixture. 3. Determine the amouht of water used to exactly fill the pote space in the 100 cubic cehtimeters of soil. Subtrąct the reading of water level on the side of the graduated cylinder from the original volume of 100 ml. Note that the water which was poured onto the soil exactly filled the pore space and thus equals the total pore volume by direct measurement. 4. Record your results below and make the necessary…Make a dilution series to get to 1:100. Start with making 1:10 dilution by adding 1mL of sample and 9mL of diluent, now continue the series to get to 1:100
- 2. The goal behind suction filtration is to remove soluble impurities that are on the surface of the crystals. Therefore, why can't you simply use suction filtration instead of recrystallization to purify an impure solid?Gas chromatography is an analytical technique that can efficiently separate mixtures based on ________. polarity density melting point viscosityVolumetric pipettes are designed to deliver a precise amount of liquid, but only if you a. submerge the end of the pipette into a solution you are delivering. b. allow the pipette to drain freely, and leave any residual solution in the pipette. c. hold the pipette at a 45 degree angle and ensure that all the liquid is delivered.
- Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 24. approach 100% purity and are used to standardize solutions at a very high degree of accuracy. a. USP grade C. Chemical pure grade b. Technical grade d. Primary standard grade 25.A buret with a glass stopcock can be used for: a. Aldehydes C. Acids b. Alcohols d. Bases 26. The following are used in the assay of ZnO, EXCEPT a. Sodium hydroxide C. Ammonium chloride b. Sulfuric acid d. Methyl red IWhich solvent should be used to wash the solid material collected from a filtration? Select one: The same solvent as the liquid in the original mixture Acetone Deionized water O Any solvent in which the solid can dissolveWhich of the following are properties of a good recrystallization solvent? Check all correct answers. Group of answer choices boiling point of solvent < melting point of crystals boiling point of solvent > melting point of crystals Crystals are soluble in solvent at low temperature and soluble at high temperatures. Crystals are soluble in solvent at high temperatures but insoluble or slightly soluble at low temperatures. Solvent boiling point is about room temperature. Impurities should be either soluble at all temperatures or insoluble at all temperatures. An abundant amount of crystals must be recoverable from the solvent.