When adding these up the end result has to be 14 because acids go from 1-7 and basic from 14-7. Basically when adding base to water solutions the hydrogen’s will get stolen, decreasing the amount of available hydrogen ions, and increase the pH beyond 7. This is important because the Keq is somewhat affected as well. Materials: - .1 M NaOH - .1 M HCl - Pipette - Wells - Beaker - Phenolphthalein - Universal - Cabbage juice - Safety goggles Procedure: 1. Gather all materials and put on goggles.
Calculate the Normality of the vinegar using the previously given equation. Na = (Nb)(Volumeb) (Volumea) C. Calculate the mass of the acetic acid in grams using the previously given equation. Massa = (Na)(GMWa) D. Calculate the percentage of acetic acid using the previously given equation. % Acid = Massa(g/L) x 100 1000g/L Discussion and Conclusion: Questions: LabPaq question guidelines: Answer questions A and G in the lab manual. Skip questions B, C, D, E and F in the lab manual, and answer these instead: A.
Duplicating a Color with Dye Trohimczyk, Brianna; Delgado, Theon Purpose: The purpose of this experiment is to match the color of the control dye with the new color of the dye produced in the test tube. Hypothesis: When two drops of red dye are placed with one drop of yellow dye in a test tube of water, the result will match the color of the controlled dye. Materials: * Four colors of food coloring (red, green, blue, yellow) * Test tubes * Pipets Procedure: 1. Place water into a plastic cup 2. Use the pipet to place 10ml of water into an empty test tube 3.
LAB REPORT: Hydrolysis of Acetylsalicylic Acid PURPOSE: The purpose of this lab is to become familiar with the identification of ester, carboxylic acid and alcohol functional groups, to understand that formation and hydrolysis of esters are equilibrium processes, to understand how ester hydrolysis yields carboxylic acid and alcohol products, and to understand what a sympathetic ink is and how such inks are visualized. PROCEDURE: 1. Crushed two 325mg aspirin tablets into powder; placed the powder in a 50 or 100mL beaker; added 2 grams of sodium carbonate; then measured and added 20mL of water. 2. Stirred the mixture occasionally; covered it with plastic wrap and allowed to stand overnight in a safe place undisturbed to hydrolyze the aspirin to salicylic acid; noticed the odor of acetic acid in the beaker the following morning.
The final crude product yield was 0.91g and the pure product yield was 0.36g. Error may have occurred during the extraction phase. Although I extracted twice with Sodium Chloride, if waste was not completely removed, it would affect the purity of the product. The distillation process may have also affected the pure product. The lab manual recommended that 0.5mL of waste be removed during distillation; otherwise it would affect the purity of the product.
The indicator Phenolphthalein was the substance used to signal when the titration reached the point at which the reactants are stoichiometrically equal as defined by the balance reaction equation. Phenolphthalein is a chemical compound with the formula C₂₀H₁₄O₄ and is often written as "HIn" or "phph" in shorthand notation. Often used in titrations, it turns colorless in acidic solutions and pink in basic solutions. Sodium hydroxide or Hydrochloric acid would not have been as effective or accurate because they would have reacted with the water vapor from the air. In this lab setup, graduated cylinders or beakers were not used.
The purpose of this experiment was to extract Trimyristin (C45H86O6 ) from ground nutmeg powder. Trimyristin is a white to yellowish-gray solid that is insoluble in water, but soluble in ether. Trimyrisin is found naturally in many vegetable fats and oils. Its synthesis was done using reflux as shown in the diagram on page 3. Allow the crystals to dry for 1 week then, weigh it, take a MP, and calculate the % yield.
General Chemistry I51 Extraction of pigments Author: Hengye Zuo Lab Partners: Meshach, Todd, Asiac Instructor: Lindsey Date lab performed: 03/20/2012 Date report due: 03/27/2012 Abstract The molar absorptive (E) of red food dye 40# (Allura red dye 40#) at 520 nm was determined to be 2.7*10^5M. The determination will be accomplished using a beer’s law analysis. A series of five standards prepared from a stock solution using parallel dilution. The absorbencies of the standards were measured and plotted. As we know the equation C1V1=C2V2, we can get a set of concentration (g/L) of different ratio of Red #40.
This method is used because it has two certain advantages, according to Nerdz-Stormes. First, the percentage of quantity of the yield is much higher with this method than if it is just manually pressed. Second, it’s aimed to get a lower boiling point of the liquid by mixing the compound with water. The theory of this distillation process is mixing compounds that contain the aimed product with water to reduce the boiling point of it, so the organic compound does not decomposed by heat. The boiling point can be reduced because of the vapour pressure of it would be the sum of water’s vapour pressure and the compound’s vapour pressure.
After that, a pH sensitive color indicator, phenolphthalein, was added, and the solution was titrated with 1M sodium hydroxide. The sodium hydroxide was added drop by drop until the solution turned pink, meaning all of the remaining acid that was not neutralized in the reaction with the antacid was now neutralized. The amount of HCl left over from the reaction could be determined by measuring the amount of sodium hydroxide that was needed to neutralize the solution. Since the 1 M sodium hydroxide and the 1 M HCl react with a 1:1 ratio, the amount of sodium hydroxide needed to neutralize the solution was equal to the amount of HCl remaining in the solution after the reaction with