Student: Mary Chrisin L. ObreroDate: October 7‚ 2014 Section: 116 Behavior of Gases and Determination of Absolute Zero Experiments 4&5 Introduction: First of all‚ the Boyle’s law (pressure-volume law) indicates that the volume of a certain amount of gas given held at a constant temperature differentiates inversely with the applied pressure when there are constant temperature and mass. Equations: PV=C. When pressure goes up‚ volume goes down (derived from the equation above): P1V1 = P2V2 =
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Gas Chromatography: Purifying alcohol Introduction The goal of this lab is to understand the principles of chromatography by purifying alcohol using fractional distillation. Running standards with gas chromatography we were able to see and calibrate our data to find not only how much ethanol our alcohol attained but also what a mixed unknown sample contained. Chromatography is a way of being able to separate substances in solution that can help not only identify the analytes (the studied
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pressure was built up in the separatory funnel but in the bicarbonate separation‚ the gas build up was much greater due to the reaction giving off carbon dioxide. When each product was weighed‚ a white crystalized structure had formed in the erlenmeyer flask. Calculations: Partition Coefficient for Water K = .36g organic layer / .04 grams water layer K = 9.0 Partition Coefficient for Bicarbonate K = .02g organic layer / .40g bicarbonate layer K = .05 Conclusion: From this lab‚ we have
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stone‚ and use this as the boiling flask of a distillation set-up. You should pre-weigh a 25 mL round-bottom and use it as the receiving flask. Cool this receiver in an ice bath since the product alkene is fairly volatile. Perform the distillation and collect the purified 4-methylcyclohexene‚ leaving behind a small amount of impurity in the boiling flask. You should record the boiling point range you observed during this process. Reweigh the receiving flask and record the mass of product recovered
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4. To practice proficiency in performing the following experimental procedures: pippeting a liquid‚ weighing by difference‚ and determining a volume by displacement. Apparatus: Tall glass cylinder‚ glass marble‚ rubber stopper‚ cork‚ 125-mL Erlenmeyer flask with stopper‚ 150-mL beaker‚ 10-mL pipet‚ pipet bulb‚ 100-mL beaker‚ rubber stopper‚ unknown rectangular solid‚ aluminum foil ~10 x 10cm‚ 100-mL graduated cylinder‚ rectangle Materials: Methylene chloride‚ hexane‚ water‚ ice‚ unknown liquids
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Isolation‚ purification and characterization of alkaloid caffeine from tea leaves Date Submitted: September 3‚ 2014 Abstract Caffeine is one of the main constituents of tea leaves. In this experiment‚ 0.0039 g of pure caffeine was isolated from tea leaves. This was done through solid-liquid extraction followed by multiple liquid-liquid extraction. Then crude material obtained was then purified by sublimation. The isolated caffeine was subjected to thin layer chromatography (TLC) together
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Abstract: The purpose of this laboratory is to convert benzophenone to diphenylmethanol. This was done by using sodium borohydride to reduce benzophenone. The product was then crystalized from hexanes then using the melting point and IR testing it was possible to characterize it. The melting point range was… Introduction: This lab is possible because of oxidation and reduction reactions. In organic chemistry oxidation is the loss of electron density around a carbon‚ while reduction is an increase
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University of Santo Tomas Faculty of Pharmacy Organic Chemistry Laboratory RECRYSTALLIZATION OF ACETANILIDE USING WATER AS SOLVENT Lagarteja‚ M.C.B.; Lim‚ H.G.N.; Lizo‚ K.J.R.; *Macalino‚ M.D.L.; Macapala‚ C. 2D-Pharmacy‚ Faculty of Pharmacy‚ University of Santo Tomas Abstract Recrystallization is a technique used to purify organic solids. This method involves dissolving of a solute in a solvent and inciting the solute to produce a precipitate from a solution. In this experiment‚ acetic
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Solution Review Complete all questions in this package. Be careful to use correct significant figures and units for any calculation problems. For all chemical equations use phase subscripts. Concentration 1. Calculate the concentration of the solution formed when 23.61 g of sodium phosphate is dissolved in 475.0 cm3 of water. 2. What volume of water is needed to dissolve 85.8 g of silver nitrate to make a 2.650 M solution? 3. What mass of magnesium sulphate is needed to make 1500
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Computerized Data Acquisition of a Second Order Reaction Abstract Introduction The rates at which reactions occur depend on the composition and the temperature of the reaction mixture. Usually the rate of reaction is found to be proportional to the concentrations of the reactants raised to a power.1 There are many reactions that have a rate law in the form of: (1) v = k[A]a[B]b According to reference1 the power to which the concentration of a species (product or reactant) is raised
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