Erlenmeyer Lab

Procedure: I used a ruler, thermometer, and scale to take measurements. I used a graduated cylinder, short step pipet, scale, and ruler to determine volume and density. I used a volumetric flask, graduated pipet, pipet bulb, scale, and glass beaker to determine concentrations and densities of various dilutions.

11. It is then repeated for the solution of unknown concentration (A, B or C).

with a balance each dose of meat tenderizer that I was putting in each well: 2g in well one, 1g in well 2, and

#2. 50.00 mL of solution #2 was removed from the flask using the volumetric pipet and was placed into a 100 mL volumetric flask. It was diluted to the line, stopped, and mixed gently. The flask was labeled solution #3. 10.00 mL of solution #3 was removed with the volumetric pipet and placed into a 25 mL volumetric flask and was diluted to the line. The flask was stopped and mixed gently.

The materials that were used to conduct this experiment include a 50 mL beaker, a 10 mL graduated cylinder, a hot plate, a ring stand, a clamp, an iron ring, a plastic funnel, an aspirator, rubber tubing, weighing boats, a magnetic stir rod, disposable pipettes, a stirring rod, a filter flask, filter paper, a Büchner funnel, distilled water, a watch glass, and litmus paper. The chemicals used in this experiment include 6M of HNO_3 (Nitric Acid), 6M of NaOH (Sodium Hydroxide), 3M of H_2 SO_4(Sulfuric acid), 6M of HCl (Hydrochloric Acid), Zinc, and Copper turnings. The experiment began with setting up the first apparatus by placing the 50 mL beaker on the hot plate and attaching the beaker to the ring stand. Then a fume hood was

• Safety goggles and safety gloves because of working with strong chemicals. Experimental Setup: The liquids in the four beakers were saturated in 100 mL of each chemical at room temperature. Beaker 1 was the control and had a pH of 6.5, Beaker 2 was the base and had a pH of 12.5, Beaker 3 was the first acid and had a pH of 4.9 and Beaker 4 was the second acid and had a pH of 0.2. Procedure: To begin with, gather all needed materials.

An overall volume of 50ml of hydrochloric acid and water should be used for every trial.

5. Use a 50mL or 100mL graduated cylinder to measure approximately 50mL of hydrochloric acid.

The materials used in this lab were water,a petri dish, matches, a 150mL beaker, one candle. a graduated cylinder and a ruler.

The 600 mL of water was placed on the hot plate to heat it to 90 degrees Celsius so that the gas would heat up and evaporate. Using gloves to prevent finger prints and residue that would increase the mass a 5 cm square of aluminum foil was attached to the flasks neck then secured using a rubber band. A rubber band was used in place of copper wire because both exhibit similar properties such as how they handle heat and they both will securely hold the aluminum foil in place. During this time the flask was weighted to gather the mass prior to the unknown being added. Then the cover was removed and 5 mL of unknown was added to the Erlenmeyer flask and resealed.

The experiment requires a burette; 5-mL pipette; 2-mL pipette; 1-mL pipette; fourteen 50-ml glass-stoppered bottles; 0.5 N sodium hydroxide; phenolphthalein, methyl acetate, concentrated HCl, glacial acetic acid, and absolute methanol.

After that, 0.1 ml of solution in Tube 4 was poured into plate 1A, the solution was spread over the surface evenly. These steps were repeated using 1ml from Tube 5 - plate 1B, 0.1 ml from Tube 5- plate 2A, 1 ml from tube 6 - plate 2B, 0.1ml from tube 6 - plate 3A, from tube 7 - plate 3B.

The final experiment is the solution of hydrochloric acid with magnesium and recording the maximum temperature it reaches. Each small experiment should be followed with a thorough cleaning of the styrofoam cups, lids, stirrers, temperature probe, and other glassware. The completely reacted solutions should be disposed of in the proper water area under the fume hood.

Next. the aluminum foil and the rubber band were taken off of the Erlenmeyer flask. 2 mL of the unknown liquid was poured into the flask. The aluminum foil was placed back on the mouth of the Erlenmeyer flask and loosely folded around its neck to make an aluminum foil cap. The rubber band was used to tightly secure the foil cap in place. Using

Pour 10ml of hydrochloric acid into a 25ml test tube this is a 100% solution.