Investigating the Reactions Between Polyvinyl Alcohol and Borax in Making a Rubber Ball

Purpose: To learn about the international system of units (SI), to become familiar with common lab equipment and techniques, to gain proficiency in determining volume, mass, length, and temperature of a variety of items using common laboratory measurement devices, to learn to combine units to determine density and concentration, and to use laboratory equipment to create serial dilutions and determine the density and concentration of each dilution.

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.

1) The materials: cup, gummy bear, triple beam balance, water, metric ruler, and pencil were utilized for the experiment.

After all materials were gathered, we then had to do five different tests to determine what the powder material does. The first test was to see what the powder materials do in water. We had to add a scoop of each of the common powders to an

In 1855, Charles Goodyear invented the first soccer ball made out of rubber. Charles was in jail for debts, but while he was in jail, he asked his wife to bring him rubber, and a rolling pin.There, in his cell, he made his first rubber experiments , kneading and working the gum hour after hour. If rubber was naturally adhesive, he reasoned, why couldn’t a dry powder be mixed in to absorb it’s stickiness? Perhaps the talc-like magnesia powder sold in drugstores? Out of jail, he tried, with promising results. After inventing vulcanized rubber, he invented the first soccer ball.

Discussion As part of the experiment, the percent composition of each component of the mixture was calculated. 51% of the components were retrieved from filtration while 49% of the solvents were retrieved from dissolving the components in a solvent. The original mixture was one globular solid-like structure.

Again, label 7 1.5ml tubes 0 thru 6. Place 15μl of each serially diluted extract into its corresponding labeled tube. Next add 465μl of media into each tube. Then 60μl of Alamar blue in each tube. Finally add an additional 60μl of cells (adjusted to 10,000 cells/20 μl). Vortex each tube for 5 seconds. Now, take 3 different samples 190μl samples of concentration 0 and put it in Wells A2, B2, and C2. Repeat this step again by taking 3 more different 190μl samples of concentration 1 and putting it in wells A3, B3, C3. It should be noted that it is important to vortex each 1.5μl tube again be-fore putting it into the 96 well plate. Contin-ue this same procedure consecutively for the re-maining concentrations.

The materials needed for this experiment included test tubes, a test tube holder, the unknown compound #202, 35mL beakers, gloves, safety goggles, ethanol (to clean equipment), stirrer (to mix solutions), the 15 possible compounds that are provided, pH strips, distilled water, wooden splints, spatula to get out unknown compound #202, waste bucket, Bunsen burner, graduated cylinder, 500mL beaker for the waste, plastic dishes to measure out compound and the scale.

1.) Measure out 20ml out of the water and place it into a glass beaker

The “Med-Squad” lab group was approached by a local manufacturer to create a toy bouncy ball that is both nontoxic and eco-friendly using only polyvinyl alcohol, polyvinyl acetate, and sodium borate chemicals. The interactions between polyvinyl alcohol and sodium borate, and polyvinyl acetate and sodium borate make an ideal bouncy ball for the manufacturers. The experiment was divided up in two weeks. Week one consisted of making the bouncy balls and week two consisted of testing the bouncy balls in different environments: at room temperature, heated, and chilled. By dividing up the experiment into two weeks, it was found to be very effective because the group had a whole class period to make the bouncy balls and then had

We can also take into account the factor of temperature difference between the mixture of borax and the crystallized borax which had settled on the bottom of the 100mL beaker. From what I have gathered during this experiment, crystallized borax was warmer than the solution above it. This is something that could greatly vary the results of an experiment as we could have pipetted 5mL of what we believed was 45*C solution but in actuality could have been much different due to incorrect temperature measurement.

The purpose of this experiment is to familiarize oneself with the general procedures determining a partition coefficient at the microscale level and learn in weighing milligram quantities of materials on an electronic balance, the use of automatic pipets, the use of transfer pipet, and the use of a vortex mixer. Also, to familiarize oneself with extraction

The pipette was used to transfer 8 mL of the 0.5 molarity solution into the graduated cylinder. Distilled water was added to raise the bottom of the meniscus to the 20.0 mL line and the solution was transferred into the beaker after it was rinsed with the solution. The pipette was used to take a small quantity of the solution and rinse and then fill a test tube with the solution. The amount of 0.2 molarity solution needed to create 20.0 mL of 0.1 molarity solution was calculated as 10.0 mL. The pipette was used to transfer 10.0 mL of 0.2 molarity solution into the graduated cylinder and distilled water added until the bottom of the meniscus reached the 20.0 mL line. The solution was transferred to the rinsed beaker and then a portion placed into a test tube that had been rinsed with the solution. The amount of 0.1 molarity solution required to create 20.0 mL of 0.05 molarity solution was calculated to be 10.0 mL. The pipette was used to transfer 10.0 mL of 0.2 molarity solution into the graduated cylinder and distilled water added until the bottom of the meniscus reached the 20.0 mL line. The solution was then placed into a beaker that had been rinsed with the solution and then into a rinsed test

In a test tube, 0.5mL of the sample will be added with 0.5 mL of water and shaken vigorously. Take note for its solubility by parts (0.5mL is one part). Keep adding parts of the solvent until the sample is soluble. If not, add until ten parts of the solvent and determine its solubility. To separate test tubes, water will be replaced with ethanol, chloroform, ether, and acetone as solvents. Same procedures were

2. Inspected two Erlenmeyer flasks and scoopula for cracks or contamination and cut 25 pieces of magnesium metal ribbon into 2 (+/- ?) cm.