Accuracy and Precision Lab Report
By Connor MacFarland
What is the difference between accuracy and precision and how can we demonstrate the difference?
100 mL Graduated Cylinder
1 Gallon of water
Unmarked Plastic Container
3 different kinds of Rocks of different sizes
Triple Beam Balance
Estimating Lengths Procedure
A piece of notebook paper was torn into 8 rectangles
Without a ruler, a line was drawn which…
Haines et al., A neutron diffraction study of quartz-type FePO4: high-temperature behavior and αβ phase transition Kristallogr. 218, 193-200 (2003)
Crystal chemical relationship between quartz (SiO2) and FePO4
Silicon dioxide is an oxide of silicon with the chemical formula of SiO2. SiO2 is a chemical compound most commonly found in Quartz and it has a space group of P3121. The lattice symmetry of SiO2 is tetrahedron, where there are 4 oxygen atoms covalently bonded to the silicon…
The purpose of this experiment was to see if different fragrances affected a soap’s antibacterial properties. In this experiment, non-scented Alconox soap was used as the control. The experimental groups consisted of Joy lemon dishwashing soap, Dawn Escapes New Zealand Springs dishwashing soap, and the soap from the campus bathroom dispenser. The subject’s hands were washed with each of these soaps for approximately 30 seconds with each soap. The subject’s right hand was swabbed for each sample.…
3.7.1. Effect of solvent and pH
The influence of the solvent on Schiff base ligand L and its metal(II) complexes were studied. The results showed that the optimal solvent for Schiff base ligand L, Co(II), Ni(II) and Cu(II) complexes were CH3CN at λemi =320, 310, 316 and 330 nm, while the optimal solvent for Mn(II) complex was DMF λemi = 312 nm, as shown in Figure 7. The effect pH on the fluorescence intensity of Schiff base ligand L and its metal(II) complexes were investigated between…
substances and finished products in a multitude of solvents. In the testing of the four starting substances for the soaps, the group found that all the substances were insoluble in water and hydrochloric acid. However, vegetable oil was soluble in sodium hydroxide whereas the rest of the substances were not. This proposes that the beginning substances for the soaps are non-polar organic materials, as shown on page 59 of the lab manual1. Then, they tested the four soaps and two detergents that…
Determining the Chemical Formula of a Hydrate
Experiment required: copper (II) sulfate hydrate, 2 crucibles, electronic mass balance, bunsen burner, iron ring, crucible tong, clay triangle, wire gauze, retort stand,
1. Individuals should wear goggles on and tied hair back before the experiment started.
2. The mass of an empty crucible cover was measured.
3. Approximately 2.00g of copper (II) sulfate hydrate samples was taken out and put into the crucible.
4. The mass of the crucible…
was crushed and 0.5 grams of ascorbic acid was mixed with 50 mL of deionized water to form the Ascorbic Acid Solution
Preparation of NaHCO3 solution
The baking soda was measured to 0.5 grams and was mixed with 50 mL of deionized water to form the Sodium Bicarbonate Solution.
Experimental Concentration of NaOH
M = Molarity or Concentration
Known moles of NaOH divided by known volume is equal to experimental concentration times experimental volume.
Experimental Concentration = 0.3 M
and the flask was attached to a ring stand to rest on top of a magnetic stirrer device. In consistent drops, 0.63 mL of glacial acetic was added and the reaction had a pH of 2, which was measured with pH indicator paper. Then, 0.50 mL of 10% w/v sodium hypochlorite (NaOCl) solution was added, and the reagents were reacted for three minutes. Shortly after, 5.13 mL of 10% w/v NaOCl was added incrementally with a Pasteur pipet for about ten minutes. A thermocouple was periodically placed on the…
of the product, the appearance of the reaction mixture changed. The main solution containing dicholormethane, benzyltriphenylphosphorium and benzaldehyde was cloudy and white. This solution changed colors when the sodium hydroxide solution was added. After only a small amount of sodium hydroxide solution was added, the reaction solution became…
Name: Sanzhar Kerimbek 20140930
General Chemistry Laboratory 1
Fall Semester 2014
Co-worker: Byungsoo Kim 20140831
The concept of volumetric analysis is a part of chemical analysis and is performed foremost with the volumetric chemical glassware (i.e. Erlenmeyer flasks, burets, pipets, test tubes etc.). The aim is to find out the concentration of one substance by reacting it in aqueous solution with the substance with…