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
Experimental Organic Chemistry: A Miniscale & Microscale Approach (Cengage Learning Laboratory Series for Organic Chemistry)
- A student performed the fractional distillation of a cyclohexane/toluene mixture. The refractive index of the distillate was measured at 1.4301 with an ambient temperature of 22.0oC. What is the mole percentage of cyclohexane (to 3 sf)?arrow_forwardBriefly describe the principles for separating the components of a mixture by solvent extraction.arrow_forwardYou are using 115% PPA and after a couple of minutes in the boiling water bath, you observe a distinct amber color in your flask. After your benchmate assembles their flask in the same water bath, you notice that your flask has become a cloudy white. Your benchmate's flask remains clear and changes to amber at a time comparable to others using 105% PPA. Your flask remains white for the duration of the heating process. What might have happened to your reaction? What evidencce supports your assumption? How would you expect it to affect your results, and why?arrow_forward
- A student determined the molar mass of an unknown ionic solid by the method used in this experiment. She found the equilibrium temperature of the ice water mixture (THE FREEZING POINT) to be 0.50°C on her thermometer. When she added 3.10 g of her solid to the mixture, the temperature fell to -4.30°C. She then poured off the solution into a beaker. The mass of the solution was 34.59 g. Kf = 1.86°C/m What was the freezing point depression ∆Tf (celsius) What was the molality of the unknown solution? How much water was in the solution? What did she find to be the observed molar mass of the ionic solid, assuming she made the calculation properly?arrow_forwardNonearrow_forwardWhich of the following refers to a composition in which its components cannot be separated by distillation? Ideal Azeotropic Eutectic Partially Miscible Binary mixturearrow_forward
- 7 How is the variation in sample composition in a powder random mix influenced by the proportion of active ingredient particles and by the total number of particles in the sample?arrow_forwardWhat measures can be taken to decrease relative supersaturation during precipitation? Explain.arrow_forwardphysical chemistry: With the given diagram below, How many phases does a mixture of these liquids have? Liquid Amount (mol) xT xW xE A 15 0.5 0.25 0.25 B 20 0.33 0.33 0.33 C 7.5 0.1 0.8 0.1 For the mixture in the problem above, what are the composition of the phases? If there are two phases, what are the compositions of the trichloromethane-rich and water-rich phases?arrow_forward
- Please I need part B and Carrow_forwardA student performed chromatography on a mixture of benzoic acid (C6H5CO₂H), acetophenone (C6H5C(O)CH3) and styrene (C6H5CHCH₂). She used alumina (Al₂O3) as the stationary phase and a 9 : 1 mixture of hexane : ethyl ethanoate as the mobile phase. Rank the order in which the compounds moved, from fastest to slowest. benzoic acid acetophenone styrenearrow_forwardWrite the balanced NET ionic equation for the reaction when aqueous SrBr₂ and aqueous K₂SO₄ are mixed in solution to form solid SrSO₄ and aqueous KBr. Be sure to include the proper phases for all species within the reaction.arrow_forward
- Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks Cole