All are properties of ideal solvent for recrystallization except: • Dissolves the sample when hot • Does not react with the target compound • Immiscible with the impurity • Has a boiling point above the sample's melting point
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- A lower and/or broader melting point range for a compound after recrystallization most likely results from ________. insoluble impurities such as dust or lint the material still being wet with the recrystallization solvent the compound decomposing in the heated solvent the compound undergoing a chemical reaction with the solventDescribe a procedure "fix" to solve the following recrystallization problems: A. No crystals are formed when the solution reaches room temperature. B. Colored impurities are present. C. Crystals are left on the filter paper during gravity filtration.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.
- How is recrystallization of an impure solid accomplished?for effective purification by recrystalization while avoiding performing a hot gravity filtration, what is the desired solubility of an impurity at different temperatures? Hot solvent solvent after coolingFiltration of samples A, B, and C show no residue left. After letting them dry in different beakers, SAmple A remains no residues. Sample B shows crystal leftovers, and sample C show brown film on the beaker walls. This means that: a. Two or more samples are heterogenous b. Two or more samples are homogenous c. all sample have 2 or more phases d. all samples are pure
- Which of the following consideration are applied when choosing a suitable recrystallization solvent? (TRUE / FALSE) True False Should have a boiling point that is ~ 30-40 ℃ above room temperature. True False Dissolve the compound in a reasonable amount of solvent. True False Should be unreactive toward the compound of interest. True False Offers moderate solubility of the compound to be purified at room and lower temperatures. True False Does not dissolve impurity at all or complete/high solubility of impurity at all temperatures.Determine each statement if it describes dissolution or disintegration. It is mainly affected by tablet hardness, presence of binders and fillers. The process of breaking down a substance that is not readily soluble May apply on solid, liquid and gaseous dosage forms. The process of breaking down a substance into tiny fragments. Involves the interaction between solute and solvent. Heat will majorly make the process faster The process closer to the absorption process. Tested using a machine with a basket rack holding six plastic tubes. The test for this process requires the sample to be tested for concentration of active ingredient over time. Usually only applies to solid dosage forms.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…
- When isolating a solid compound after recrystallization, which is the appropriate technique to use, vacuum filtration or gravity filtration?Why is recrystallization not applicable to samples which contain large amount of impurities?Based on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?