One thing that definitely went wrong in the lab was that we had to round about two of our measurements and the reason being was that they were exact. To exemplify, when we were reading the volume for the finishing measurement of the base for trial three, we got exactly 45.00 mL. The only problem was that, we had didn’t really have the two significant decimal numbers. Hence, we rounded our volume to 45.01 mL. Also, we got exactly 23.00 mL for our finishing volume of the acid for trial three. Therefore, once again we rounded it to 23.02mL in order to get at least two significant decimal numbers.…
I: Introduction: a. background information- Physical Changes are changes that do not involve a change in molecular structure. They can be identified by a change in size, a change in shape, or a change in the state of matter. Chemical changes are changes that involve the re-arrangement of atoms in the molecule.…
The purpose of this experiment is to determine the pH of known substances by use of a pH color indicator of red cabbage and the use of a pH meter. As well as, to observe the pH changes in a substance by adding in more basic of acidic to buffered solutions and unbuffered solutions. This experiment will also will show how to calculate H3O+, OH- and pH by use of known values. In order to do this lab, there are a few key components one needs to know and understand first.…
While he wanted to achieve a solution of 400 mL, he ended up with a solution of 420 mL because he did not take into account the volume that the solute (sucrose) would take up within the solution. This additional volume would thus also change the concentration; however, even if the actual concentration amounted to 400 mL, he would still have not obtained the 4M he assumed he was creating. This may be due to guessing, but he may have also assumed that by adding 400 mL of water, that would make the solution 4 M, regardless of the amount of solute he added into the mixture (If he wanted a 3M solution, he may have thought he could add 300 mL of deionized water). Because of his error, he ended up with a solution with a much smaller concentration. Therefore, when the student wants to create a solution of certain concentration, he needs to know either how much solution or solute he wants and then calculate for the other component in order to achieve the desired concentration.…
The 150mL beaker containing water was placed on top of the balance scale and the Alka-Seltzer tablet was placed next to it. The mass of the beaker and tablet was recorded. After recording the initial mass, using the Samsung Galaxy S7, the slow-motion option was selected to film the experiment. Before dropping the Alka-Seltzer tablet into the water, the iPhone 4 was used as a timer and the recorder made sure that the mass on the scale and the timer were visible in the video. The tablet was dropped into the water and the timer was started at the exact time.…
The control group was Brawny brand. The experimental group was Bounty, White Cloud, Homestore, Walmart Brand, and Sparkle. First, move one of the brand’s a paper towel sheets to a balance to see what the mass is. Then, take the dropper and drop water on the flat paper towel…
Placed the probe in unknown solution created from the solubility test. Pressed collect and recorded the average…
By adding Hydrochloric acid into solid Magnesium, in Data table #2, when Hydrochloric acid was first been added to solid Magnesium, the ribbon immediately start to bubble and producing fumes at the same time with a burning sound. Magnesium start to turn into a white liquid form. After the bubble start to disappear, more Hydrochloric acid was added, and the reactions repeats. Until none of the shiny silver Magnesium ribbon can be seen, and there is no more bubble, the reaction is over.…
Introduction The Chesapeake Bay that is 200 miles long is considered the largest estuary in the United States. It is home to more than 17 million people (NOAA). Baltimore, one of the most important North Atlantic port is located on the Chesapeake Bay. Oysters are one of the biggest resources of the Chesapeake bay.…
To keep the trials constant, the starting water quality needs to stay the same, the amount of water needs to stay the same, and the container needs to stay the…
In the second method it was 0.86 ppm and in the third 7.31 ppm. Comparing these data, we see that the concentrations using the different methods, do differ a lot from one another. One of the reasons for this huge difference, was the use of a serological pipette instead of volumetric pipettes. For all transfer of solutions where a pipette was needed, a serological pipette was used. Now this could be one of the main causes of error in the data, because a serological pipette is not accurate, however a volumetric pipette is.…
Laboratory Techniques and Measurements Tiffany Abbe Introduction: In this lab I will be adapting more about how to utilize distinctive estimation instruments and comprehend the diverse procedures included. Figuring out how to ascertain temperature and length. Will likewise make estimations utilizing the SI frameworks for fixation, thickness, and volume. While having the capacity to reate arrangements of building so as to change focuses and densities as tock arrangement.…
Determination of the Concentration of Acid in Gastric Juice Introduction Titration is a method where a solution of known concentration is used to find the concentration of an unknown solution. A standard solution is a solution of precisely known concentration. The aim of this experiment was to go over the use of pipettes, burettes, titrations and also to reinforce the concept of molarity.…
Does a Measurement Result in a True Value? Limitations of Measurements Elizabeth Lechtholz-Zey & Marisa Loredo 10/5/15 CHEM 101-08 Purpose To determine the differences in precision and accuracy in weighing 10 mL of water using a 50 mL beaker, a 10 mL graduated cylinder, and a 50 mL buret. Data Temperature of water: 23.0ºC 100 mL beaker weight: 50.557 g # of additions of water to the 100 mL beaker * 50 mL beaker (±5 mL) * 10 mL graduated cylinder (±0.05 mL) * 50 mL buret (±0.05 mL) 0 0.00 g 0.00 g 0.00 g 1 7.48 g 9.91 g 9.95 g 2 14.23 g 19.70 g 19.83 g 3 21.38 g 29.56 g 29.85 g 4 29.20 g 39.44 g 39.77 g 5 35.91 g 49.30 g 49.72 g * 10 mL graduated cylinder (±0.05 mL) 0 50.557 g 1 60.340 g 2 70.010…
Start of the process of setting up the experiment, by adding 400 millilitres of water at a temperature of about 32°C into the beaker. Have a timer…