The densities of 3 different solutions, water, saltwater, and an unknown solution, were calculated using a triple beam balance and a graduated cylinder. Density was also used to discover how much zinc and copper are found in a penny. The following results were found: water’s density, 1.02 g mL-1; saltwater’s density, 1.05 g mL-1; and the unknown substance labeled two’s density, 1.04 g mL-1. The percent error was calculated for water’s density as 2%. The composition of a penny was calculated using volume by water displacement and the mass of the pennies.…
1. Heat water in a pan or beaker until it is boiling vigorously. 2. While you are waiting for the water to boil, measure the mass of the metal with your scale. Remember to report your answer to one more decimal place than what is marked off by the scale.…
Then the mass of a weighing dish was recorded along with 0.35 g of KHP. The mass of an Erlenmeyer flask was then weighed as well. After both flask and substance were weighed, the combined mass of the flask and substance was recorded…
Using the 25 milliliter (mL) graduated cylinder, measure and pour 22.5 mL of distilled water (from a new, unopened container) into each of jars #2, #3, #4, and #5. 6. Using the 25 mL graduated cylinder, measure and pour 25 mL of the colloidal silver solution from the original bottle into jar #1. Jar #1 will hold the 500,000 µg/L (undiluted) concentration of colloidal silver. 7.…
We also used a weigh boat to determine the mass of the pennies before and after 1982 and the unknown metal sample. After we divided the mass of the pennies and the metal sample to their volume using…
Next, heat the beaker over a hot plate on medium heat until the colour fades into a lighter shade. Remember to stir occasionally, and stop heating after the colour changes. Allow the beaker to cool before measuring the mass of the beaker with anhydrous copper (II) sulfate, and record the mass onto a table. Find the mass of the beaker with anhydrous copper (II) sulfate, and record…
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…
When beginning the experiment we observed and recorded the appearance of the materials in use like instructed. We weighed our materials out on a tared scale and placed them all in their corresponding test tube. We mixed and centrifuged our solution all three times for the appropriate times and decanted them accordingly. After getting all our liquid we heated up until a white solid formed, waited for it cool…
Introduction An experiment was generated in the lab to enhance the understanding on taking the percent composition and formulating the empirical formula of a hydrate. In chemistry, hydrates are compounds which absorb water molecules and incorporate them as part of a structure. The hydrate in this experiment was an inorganic hydrate, meaning the bonds between water molecules were inadequate (What is a hydrate? (n.d.)).…
Percent Copper In Brass Lab Conclusion Emily Oleisky The purpose of this lab was to observe the amount of light a solution absorbs, and use the relationships in the Beer-Lambert Law to determine the quantity of a certain compound within a complex sample. First, the relationships between wavelength, concentration, and absorbance were determined. This lab focused on identifying the absorption of copper in various brass samples, and finding the percent copper in brass. In the first activity of the lab, the scientist was trying to determine the difference in molar absorptivity across various wavelengths of multiple salt solutions.…
Sarah Bounab BQD Experiment 2: Copper/Iron Stoichiometry Abstract: The purpose of the Copper/Iron Stoichiometry lab was to determine which of the two possible iron sulfate compounds formed when reacting aqueous copper(II)sulfate with solid iron metal. The techniques used in this lab were weighing by difference, quantitative transfer, and vacuum filtration. At the end of the experiment it was found that iron was the limiting reactant and iron(II)sulfate was a product of the reaction between 7.0002g of copper(II)sulfate and 2.0101g iron metal which produced 2.3037g of copper product with a percent yield of 100.72%.…
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.…
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…
Experiment Summary The purpose of this experiment was to determine the copper content of brass using iodometry. This was accomplished by creating a thiosulfate solution and standardizing it by titrating using a known amount of KIO3. The second part of the experiment involved preparing a brass sample and allowing copper to react with excess iodide to form I2. The resulting I2 was then titrated with the thiosulfate standard.…
Set up a hot plate and place a 400-mL beaker filled half-way with tap water. 2. Use a balance to weigh out 10 g of KNO3 on weighing paper. Place the KNO3 from the weighing paper into the 25 * 200 mm test tube. 3.…