growth if no crystals are forming upon a. scratch air-liquid interface on flask with a glass rod or spatula b. add a seed crystal c. boil off excess solvent volume d. all options are possibilites
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10. Which is a way to induce crystal growth if no crystals are forming upon
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- . When checking the melting point of your impure sample, what temperature should you set as thestarting temperature (the SET temperature) and what should the ramp rate be?1. What is drying to a constant weight? 2. Aside from sieving, what other methods are used to determine particle size. Give and describe briefly at least two methods.Volumetric 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.
- In which of the following scenarios might you expect the observed melting point to be depressed? Choose all that apply. a. The heating rate for measuring the melting point was set too high. b. The percent recovery of recrystallized solid was less than 100%. c. A solid that was recrystallized from hexane was filtered and dried without washing with additional hexane while it was on the filter funnel. d. A solid recrystallized from toluene was left on the filter funnel for only a short time before its melting point was measured. e. The melting point capillary tube was packed with too much material.Rank the following mobile phases from greatest to weakest eluting power: hexanes, ethyl acetate, and 1-to-1 hexanes to ethyl acetate. (eluting power = the ability to move spots up the TLC plate)Why is catalytic dewaxing not considered as a separation process? and
- sketch a schematic showing how a liquid sample can be extracted from a liquid pipeline?This is not a graded assigment, is just a practice problem.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.