Methyl Benzoate Lab Report

water during the equilibration period of 10 minutes. Vials 1,2, and 3 should be in the bath containing water at

In workshop 2, we have substances such as ferric chloride, fine etch crystals and photoresist developer. Whilst handling these substances we must wear protective goggles to avoid any splash or fumes getting in contact with the eyes causing redness, irritation and blurred vision. Gloves and protective clothing to avoid any spillage contacting the skin and causing irritation, burns or pain. We use vapour respirator to avoid any inhalation of any toxic fumes causing coughing or sore throat and wash our hands after handling to avoid indigestion causing abdominal pain, vomiting, diarrhoea, shock or collapse.

2. List two possible hazards in this laboratory experiment Calcium chloride solution can be harmful and can cause irritation to skin, eyes, and respiratory organs. Ethanol is flammable and is mildly toxic as well. Another hazard could be the beaker breaking. 3.

will be placed on each ice cube needed for the experiment. • 1 bag of white sugar, 1 tsp. will be placed on each ice cube needed for the experiment. • 1 small saucer (plate) that will be where the ice cube is placed. • 1 spoon (teaspoon) to use to drop the materials onto the ice • Timer to measure the time on how much the ice has melted at a certain point.

After the solution had reached the desired temperature of 80°C, a stir bar was placed inside the flask and the titration using the KMnO4 solution began. The titration process was considered completed when the solution had changed color from clear to a light pink. Once the color change was apparent, the final volume of the KMnO4 solution used was recorded. The process was then completed once more to ensure accurate results.

Hazards The substances used during the experiment have some hazardous drawbacks. The only hazard of working with p-anisaldehyde is the danger involved if swallowed (4-Methoxybenz-aldehyde). This compound is not combustible. Some hazards of working with benzoic acid are irritation to the nasal cavity and eyes if fumes come in contact (Benzoic acid).

In a 100-mL beaker, 6.0 mL of concentrated sulfuric acid (H2SO4) was cooled to 0 ˚C and then 3.05 g of methyl benzoate (C6H5CO2CH3; density=1.08 g/mL) was added. In two different beakers, 2.0 mL of concentrated sulfuric acid and 2.0 mL of concentrated nitric acid (HNO3) were cooled in an ice bath. Both acids were mixed together and the mixture was allowed to cool in the ice bath. The mixture in the 100-mL beaker was cooled to 0 ˚C. While still remaining in the ice bath, the acid mixture was slowly added into the methyl benzoate solution by the use of a Pasteur pipet. The temperature of the solution was controlled by swirling the solution and stopping the addition of acid mixture when the temperature raised.

Risk Prevention for Propanol: Keep away from flames, due to flammability. Wear safety glasses, to protect eyes. Wear gloves and apron to remove the factor of skin irritation. To avoid inhalation, ventilation is to be turned on. Also do not

5. The Erlenmeyer flask was placed on the ring stand and KMnO4 was added and stirred until a light pink color was reached. The initial and final volume of the KMnO4 was recorded with the initial volume always starting at 0.00 ml. Steps 4-5 was repeated and recorded two more times for the initial and final volume of the two remaining flasks.

According to Plog and Quinlan (2012) they state that each and every time an industrial hygienist works with a chemical, the industrial hygienist needs to understand the hazards posed by the chemical in order to perform a proper risk assessment. The industrial hygienist possibly will discover that the material is flammable, or explosive, or may react with common substances such as water or air. Another

Stir the mixture and place the test tube back into the water bath. Record the time of how long it takes the purple color of the solution to disappear and the temperature of the water bath.

Transfer the vial contents into the warmed media and centrifuge at 1000 rpm x 5 min.

This was done for 15 minutes until there were no visible vapors coming from the reaction mixture. The reaction mixture was then poured into a 50-mL beaker containing 5g of ice. The reaction flask was rinsed three times with 2 mL of dichloromethane. The rinsing was also added to the ice mixture.

Acetone, which used to mix with ground nutmeg seed and wash the residue, is not very toxic but highly flammable and also has easily evaporable property. From this reason, we have to pay special attention to flame around us when doing experiment.

Sodium nitrate: Causes slight irritation if inhaled, ingested, or exposed to the skin or eyes. If the compound is inhaled, breathe in fresh air; further medical attention may be necessary if symptoms are more severe. Ingestion will not likely have serious symptoms, but if such symptoms do develop, seek further medical attention. If the compound comes in contact with skin, wash with soap and water, and