The boiling point and melting point can also be used to identify an unknown substance. Date:_________________ Name____Nic munoz ________________ 1. Title: 1pt Liquids and solids 2. Procedure (4pt) (Write the procedure in your own words after you read the manual) 1. B.Pt: I poured rubbing alcohol in a beaker and rubber banded it with the thermometer.
Then you put the remaining liquid (neutral component mixture) through the suction filtration funnel to isolate the crystals. After 10-15 minutes, the crystals will be dry and you can weigh them and find their melting point. How is the neutral component of your 3-compound mixture isolated from the final methylene chloride solution? 16 of 22 4/16/12 9:15 PM StudyBlue Flashcard Printing of Lab Final 2211L UGA http://www.studyblue.com/servlet/printFlashcardDeck?deckId=... Name the four active ingredients that we will be testing for in the TLC of Analgesics lab: Ibuprophen Caffeine Acetaminophen Acetylsalicylic acid What solvent system will you be using to dissolve the common analgesics (power) in preparation for TLC spotting? Methylene chloride: ethanol (1:1 solution) What solvent system will you be using to "develop" your TLC plates in the TLC of Analgesics lab?
Ashley Peccatiello Experiment 7 – Dehydration of 2-Methylclyclohexanol, Tests for Unsaturation, and Gas Chromatography Date Performed: October 25, 2012 Date Written: October 29, 2012 Purpose: To dehydrate 2-methylclyclohexanol to obtain two isomers. To separate the products by simple distillation. To analyze the sample by introducing the technique of gas chromatography and unsaturation tests. Reaction: Figure 1. Overall reaction of the acid-catalyzed dehydration of 2-methylcyclohexanol Figure 2.
Alex Evans Sanders Dellinger Ryan Shockney Rashaad Williams October 18, 2010 Experiment 29 Procedure Proposal In this experiment, the experimenter will be given a one gram sample of Chromite. Chromite is defined as an Iron Magnesium Chromium Oxide. The objective of this lab is for the experimenter to determine if Iron, Magnesium, and Chromium are in the unknown sample, and from these conclusions, infer if the unknown sample is actually Chromite. In doing this, multiple laboratory skills are needed, along with general knowledge on the elements comprised in the experiment to be covered. As aforementioned, the main objective of this lab is to determine whether or not the unknown sample is in fact chromium.
The column is now ready for the addition of the mixture to be separated. 2.) Separation of the Fluorene and 9-Fluorenone Mixture: Accurately weigh 0.1g of the 1:1 mixture of fluorene and 9-fluorenone mixture, place it in a small test tube, and dissolve it in 0.5mL of petroleum ether. Add a few drops of dichloromethane, just enough to effect solution. Transfer the solution to the top of the column with a Pasteur pipet.
Radu Purtuc | Chemistry 231 - Lab | Section 32 Ronnie :: team-member TECH 705, SEPARATING ACIDS AND NEUTRAL COMPOUNDS BY SOLVENT EXTRACTION - MACROSCALE EXTRACTION July 6, 2006 Lab Report INTRODUCTION Purpose: using extraction technique to separate acetanilide, p-toluic acid, and p-tert-butylphenol; then measure the melting points of each compound and comparing them to the statistical values. Background: separating acids and neutral compounds by solvent extraction is a useful technique used in practice by chemists to separate organic compounds from mixture of other compounds. It generally involve several steps, with limiting factors being the number and output purity of compounds to be extracted from source mixture. A number of specific compound solvents not inter-miscible are used to separate and dissolve compounds, and a physical transfer between solvents is employed. An example of use is cleaning compounds of impurities, where different solvents work as a molecular filter that interacts differentially with compound and impurities respectively.
2. Data table #1 (for the pure solvent) and Data table #2 (for the unknown MW determination) with all the data (like those found on page 13 of the lab manual). Results table #3 with all the data (like the one found on page 16 of your lab manual). Please be sure to include your partner’s name. Partner: Tyler Smith Data Table #1 Pure Solvent Mass of test tube + cork 45.502 g Mass of test tube, cork, + p-xylene 70.199 g Mass of p-xylene 24.697 g Data Table #2 Unknown Molecular Weight Determination Unknown letter C Mass of solid unknown 2.256 g Data Table #3 Results Freezing point of P-xylene, T°f 13.4 °C Freezing point of solution, Tf 10.8 °C Value for ΔTf 2.60°C Molality of unknown solution, m 0.60 m Mass of p-xylene, g 24.697 g Mass of p-xylene, kg 0.0247 kg Mols unknown solution 0.015 mols Mass of unknown added 2.256 g Molecular weight of unknown solute 1.5 x 10 2 g/mols 3.
Limiting Reactant Lab Rona Hunter August 31, 2011 Purpose: The purpose of this lab is to determine the limiting reactant in a salt mixture, and to determine the percent composition of each substance in a salt mixture, therefore increasing our understanding of the concepts of limiting reactants, percent composition, and laboratory techniques of heating and filtering precipitates. Procedure: Weigh two samples of about 1.0 g of the salt mixture in separate beakers. Add about 200 mL distilled water, stir, and allow precipitate to settle. Heat the solutions on a hot plate while covered with a watch glass, at 80-90 degrees Celsius for 30 minutes. Allow the precipitate to settle, and heat 30 mL distilled water.
5a. Place a small amount (the size of an aspirin tablet) of copper II sulfate pentahydrate in a clean dry test tube and record your observations. Using your test tube holder, tilt the test tube and gently heat the contents for 4-5 minutes, while recording your observations. Make sure to observe the upper end of the test tube while heating. Allow the test tube to cool and record your observations.
Prelaboratory preparation: Read pages 1 – 30 and 45 – 54 of the lab text. You may disregard the microscale distillation procedures of TECH 0704. Answer in your laboratory notebook the Safety Quiz on pages 11 – 12 and the Prelab Questions 1, 2a, 2b, 3 -5, pp. 67 - 68. EXPERIMENT: TECH 0704, Distillation, macroscale technique only, simple and fractional: Substitute a mixture of 25 mL ethanol and 25 mL water for the toluene/cyclohexane mixture.