Chemistry 1211K Lab Report Briana Limage Drawer #D20 Tuesday December 2‚ 2014 Lab Day and Time: Tuesday 2-5 Unknown # 4224034-DF14 Introduction The purpose of this semester long experiment was to determine an unknown organic acid. An organic acid is an organic compound with acidic properties. A base reacts with acids to form salts. Titrations are used to determine the concentration of unknown substances. The purpose of the KHP experiment was to determine the molarity of NaOH. HCl
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Determining the Optimal Temperature and PH of Barley Amylase Abstract The purpose of this experiment was to find the optimal temperature and pH of barley alpha-amylase. I hypothesize that the optimal temperature would be 55 degrees Celsius and the optimal pH would be 5.5. In this experiment‚ the starch is used as a substrate to examine the optimum temperature and pH for the reaction of alpha amylase. It is known that the measuring of disappearance (absorbance) of the substrate starch with iodine
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malonate‚ 2.5 mL of absolute ethanol‚ 0.05mL of piperidine‚ o.002mL of glacial acetic acid‚ and a boiling chip were placed in a flask. The mixture was equipped with a water-cooled condenser plugged with a cotton plug to prevent evaporation. The mixture was allowed to reflux for two hours. Once the mixture was done refluxing‚ it was transferred to a 25mL Erlenmeyer flask. 3.5 mL of water was added and the solution was placed in an ice bath. Once crystallization was complete the crystals were removed
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the use of solid supported reactions and the use of alternative energy sources. Materials & Methods * 0.43ml of Benzaldehyde 0.30ml of pyrrole * 0.63g of Silica Gel 15ml of Ethyl Acetate * 25 mL Erlenmelyer flask Glass rod * Microwave oven Pyrex watch glass * Beaker Cuvette * UV-VIS spectroscopy * 0.43 mL of benzaldehyde
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of 80%. Naphthalene had a relatively high percent recovery‚ and the loss of product can be explained by error inherent. The low percent recovery of 4-nitroaniline is mainly due to the fact that anhydrous sodium sulfate was accidently added to the flask. Therefore‚ some product was lost as the aqueous solution with the protonated 4-nitroaniline reacted with the drying agent. However‚ more errors to explain the results will be discussed later. 4-nitroaniline had a melting point of 147.1℃-154.1℃. The
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and held over the blue cone of fire for approximately 7 seconds. If the substance was melting‚ then the substance being tested had a low melting point. For the solubility test‚ a small amount of compound was placed into an Erlenmeyer flask and 10 mL of water was added. The flask was swirled and observed for one minute. If the sample dissolved‚ then it had high solubility in water. For the conductivity test‚ the two ends of the tester probe were held near the dry sample to see if the sample would conduct
Free Ionic bond Chemical bond Electron
Objective Determine the concentration of acetic acid of vinegar‚ in terms of (m/m). Introduction Neutralization is a reaction of an acid with a bases to produce a salt and water. For example‚ the reaction of the strong acid HCl with the strong base NaOH produces the salt sodium chloride and water HCl(aq) NaOH(aq) ( NaCl(aq) H2O(l) Since the acid‚ base‚ and salt in this reaction are all strong electrolytes‚ the net ionic equation for this reaction is H(aq) OH-(aq) ( H2O(l) This same result
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silver crystals that result. These measurements can then be used to determine the number of moles of reactants and products in the reaction and calculate their mole ratio. II. Equipment: Balance Labeling 50 ml beaker 100 ml beaker 125 ml Erlenmeyer Flask Spatula Stirring rod Wash bottle and distilled or deionized water Wooden splint III. Reagents: Acetone‚ CH3COCH3 Copper Wire‚ Cu Nitric Acid‚ HNO3 Silver NItrate‚ AgNO3 IV. Procedure: 1. Obtain a clean and dry 50-mL beaker. Zero the
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Ml of the unknown labled “no. XX- 0.10 mL” 3) Add the compounds to the same Erlenmeyer flask 4) Add 2.0 mL of 95% ethanol and 1.5 mL of 2 M sodium hydroxide solution to the flask 5)Stir with magnetic stirrer for 15 minutes or longer if precipitate still forming (if cloudy after 15 mina heat mixture on a asteam bath or in boiling water for 10 mins then cool to room temp) When precipitate is complete cool flask in ice-water bath for 10 mins MEANWHILE--- A)place 4 mL of 4 acetic acid
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and ester. If some ingenious way to remove the lower layer from the condensate and still return the upper layer to the reaction mixture can be devised‚ then the equilibrium can be upset and nearly 100% of the ester can be produced in the reaction flask. The Dean Stark trap shown below is one method to solve this equilibrium
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