Interpretation:Reason for no direct connection of filter flask to water aspirator pump in vacuum filtration should be determined.
Concept introduction:Vacuum filtration is process that is used to separate solids from solvents after recrystallization. Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
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Chapter 3 Solutions
OWLv2 with LabSkills for Gilbert/Martin's Experimental Organic Chemistry: A Miniscale & Microscale Approach, 6th Edition, [Instant Access], 4 terms (24 months)
- Indicate which of the two filtration techniques, gravity ( G ) or vacuum ( V ), is suitable for each of the following operations. a) Hot filtration b) Removal of decolourising carbon c) Isolation of recrystallized solute from solution.arrow_forwardWhen would it be preferable to use a plastic volumetric flask instead of a glass flask?arrow_forwardFor each of the following statements, answer TRUE or FALSE and explain your answer briefly. Corrections for water density, thermal expansion, and buoyancy difference are always required for the calibration of volumetric flask.arrow_forward
- how to use Gas Chromatography in Cosmetics Provide a procedure on how to do this example that you provided. Explain the procedure and what data would you gather?arrow_forward(1) A plastic piece was being analyzed by flotation methods. The piece of plastic was suspended in a solution which had an equivalent density. 8.26 mL of this solution were placed into a measuring device that had an empty mass of 43.33 g. The new mass of the device and solution was 52.17 g. Use this information and determine the density of the plastic (i.e., same as the density of solution!). (note, i.e. stands for "id est" in Latin. It is identical to "that is" in English) thatarrow_forwardWhy does the temperature on the thermometer decrease after collecting the first fraction before increasing to the second fraction?arrow_forward
- 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.arrow_forwardWhich of the three methods, (Use of Separatory Funnel, Decantation or Use of Pasteur Pipette) do you believe is most suitable for transferring large volumes of liquid mixtures and why?arrow_forwardIn recrystallization, fluted filter paper is used instead of a regular cone because it minimizes its contact with the glass funnel. Why is this important?arrow_forward
- Tooling for a vacuum deposition system is cleaned and reassembled. Unfortunately, a drop of water 0.125 cm3 in volume is left in the bottom of a screw hole. Due to the obstructed path to the pump, a negligible amount of water escapes during the early stages of pumpdown, and the drop becomes a virtual leak at a chamber pressure of 4.3E-06 torr. Find the volume of gas formed by the water at this pressure (assume it stays at room temperature). The density of water is 1g cm-3 and the molecular weight 18 g mole-1. (First, determine the number of moles in the drop of water, and use the ideal gas law to determine the volume)(b) To make this result clearer, what is the added time (in hours) to pump out this chamber due to this droplet if the pump, at that pressure, has a rate of 1480 L/s?arrow_forwardWhat are the physical states of dispersed phase and dispersion medium in foam rubber.arrow_forwardEnumerate at least two important things to do to maximize yield when using vacuum filtration in the synthesis of aspirin.arrow_forward
- Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks ColePrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning