Interpretation:Observation of original melting point as
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
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)
- The principle of a rotary evaporator is the same as that of:1. vacuum distillation2. reflux3. fractional distillationarrow_forwardAnhydrous MgSO4 is used to:1. Form a salt with the compound dissolved in the solution2. Remove water from a solution3. Neutralize a solutionarrow_forwardDistillation under reduced pressure or vacuum consists of:1. Achieving distillation under anhydrous conditions.2. Causing a decrease in the distillation rate.3. Decreasing the pressure to lower the boiling point of the compound to be distilled.arrow_forward
- At the end of the silica gel production process, color changes occur during drying. Explain these color changes.arrow_forwardIf CoCl2/H2O is dissolved in a mixture of H2O and concentrated HCl in a test tube, the tube is gently heated over a flame to approximately 80°C and then cooled externally. Explain the color changes that occur.arrow_forwardWhen producing silica gel, color changes occur at the end of the drying process. Explain these color changes.arrow_forward
- Design experiments in UV-Vis to figure the optimal mole ratio of copper (1:1, 2:1, 3:1 and etc)versus ethambutol using all necessary chemicals including dihydrochloride and copper nitrate hemipentahydrate and sodium hydroxide. Show how UV-Vis absorbance and maximum wavelength would change in responsearrow_forwardCorrect each molecule in the drawing area below so that it has the condensed structure it would have if it were dissolv a 0.1 M aqueous solution of HCI. If there are no changes to be made, check the No changes box under the drawing area. No changes. HO—CH,—C—CH,—OH X 5 2 2 2 HO–CH,—CH,—C—CH,—OH Explanation Check Center Accessi ©2025 on 5 Carrow_forwardMake the calculations to prepare 2M H2SO4, from concentrated H2SO4 (98%; density: 1.84 g/mL).arrow_forward
- H CH3 CH3 b) Write the products of your compound and the following reagents. If the reaction would not work for your compound, write "no reaction" and explain the problem. NaCN H* H₂NNHCH5 H* -à NaBH -à CH2MgBr Cro₁₂ --à H3O+ -à c) Would your compound give a positive Tollen's test? Why or why not?arrow_forwardHomework 4 Chem 204 Dr. Hellwig Consider this compound, which will be referred to as "your compound". a) Name your compound according to the IUPAC system. Include stereochemistry (E/Z/R/S) H CH3 CH3arrow_forwardWhat is the mechanism for this?arrow_forward
- Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks Cole
