A piece of filter paper is placed in the TLC developing chamber to: Choose one: provide a lining for the TLC plate to rest on. help the chamber saturate with the developing solvent's vapor. make it easier to visualize the solvent front level. protect the TLC plate.
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A piece of filter paper is placed in the TLC developing chamber to:
Choose one:
Step by step
Solved in 2 steps
- 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.In TLC, point of origin refers to The bottom edge of the TLC plate O The spot where the chemical has moved to after the TLC run O The highest point on the plate to which the solvent has traveled O The spot where the chemical is placed on a TLC plate before the TLC runWhat are pipeline slurry systems? How do they function?
- Gas chromatography is an analytical technique that can efficiently separate mixtures based on ________. polarity density melting point viscosityThe solvent level in the development chamber should be above the level of the spotted compounds on the TLC plate. Group of answer choices True FalseUse special gel loading tips or a micro-syringe to load the complete sample in a narrow well. Take care not to poke the well bottom with the tip as this will create a distorted band. Never overfill wells. This could lead to poor data if samples spill into adjacent wells, and poorly resolved bands. Load 20-40 μg total protein per mini-gel well. -If you have a lysate with protein concentration of 1500 ug/mL, how much sample you need to load according to the step indicated in D.3
- A serial dilution is performed using the above ATP stock, as follows below. Determine the concentration, in µg/μl, of tube 3. 0.1 mL original sample 0.5 mL diluent 0.1 ml transfers TU 1 2 3 4 5 6 0.1 ml. discarded after mixingMultiple 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 IThe volume of the solution that can be measured with 5-10 microliter pipette and 2-20 microliter pipette is 0.005-0.01 mL and 0.002 mL-0.02 mL. The volume of the solution that can be measured with 20-200 microliter is 0.02-0.2 mL. The volume 1 mL of solution is measured with 100-100 microliter which has capacity of 0.1 mL to 1 mL. What would the display read for 0.10 mL, 0.20mL, 0.40mL, 0.60 mL, 1.0 mL read when using the micropipettes mentioned above
- A supporting electrolyte is usually added to the analyte solution to minimize solution resistance.minimize solution conductivity.make the analyte less soluble in solution.increase the scan rate.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?If you have an empty burette in a burette clamp, in what order do you do these steps to fill the burette with liquid (either water for washing, or the titrant)? Drag the steps below into the correct brder. Step 1: Step 2: Step 3: Step 4: Step 5: Step 6: Step 7: Close the tap. Remove burette from clamp. Hold burette with top below eye level. Put plastic funnel into top of burette. Fill burette with liquid. Remove plastic funnel. Return burette to burette clamp.