# Laboratory glassware

Decent Essays
Improved Essays
Superior Essays
Great Essays
Brilliant Essays
Page 1 of 21 - About 206 Essays
• Improved Essays

For example, S=√(〖∑▒〖(x-x ̅ ̅ 〗)〗^2/(n-1) □(⇒┬ )) √((〖∑▒〖((7.50-7.20〗)〗^2+〖(6.77-7.20)〗^2+〖(7.17-7.20)〗^2+〖(7.84-7.20)〗^2+〖(6.73-7.20)〗^2)/(5-1) ) S=√(0.906/4)=0.48 g/〖cm〗^3=0.48 mL Water added by 50 mL beaker Water added by 10 mL grad cylinder Water added by 50 mL buret Average volume (mL) 7.20 mL 9.88 mL 9.96 mL Standard deviation (mL) 0.48 mL 0.044 mL 0.060 Absolute error for glassware (mL) 2.8 mL 0.12 mL 0.04 mL Relative error for glassware (%) 28.0% 1.2% 0.4% Relative standard deviation for glassware (%) 6.7% 4.5% 0.60% The absolute error shows the accuracy of the experimental error compared to the true value. Compare the amount of each aliquot to the average volume of each. An example of how to calculate this is shown below. error=X_true-X_experimental □(⇒┬ 10 mL-7.20 mL=2.8 mL) To find the relative error, the following formula is used: % error=(|X_true-X_experimental |)/X_true x 100% (|10-7.20|)/10 x 100%=28.0% To find the relative standard deviation, use the following…

• 1103 Words
• 5 Pages
Improved Essays
• Improved Essays

The graduated cylinder was used to pour the 90 mL of tap water into the 150 mL beaker with G2 powder. The mixture was stirred with a stirring rod until it had completely dissolved. 7. A paper towel a stirring rod was then used to clean and dry the graduate cylinder of any remaining water. 8. The G2 mixture was poured into the graduate cylinder and was weighed. An analytical balance was used for this process. The mass of the graduated cylinder (Step 4) was subtracted from the graduated cylinder…

• 694 Words
• 3 Pages
Improved Essays
• Improved Essays

To begin the first part of the experiment, zeolite and magnetized zeolite had to be synthesized. First, it was necessary to set up a contraption to hold a thermometer in place. This was done using a split cork and a 3 prong clam on a ring stand. 50 mL of 3.0 M NaOH was then added to a 250 mL beaker with a magnetic stir bar placed inside. After placing the solution on the stir bar, 3.7560 g of (sodium aluminate) was added to the solution. The thermometer was also added to the solution, but it…

• 398 Words
• 2 Pages
Improved Essays
• Improved Essays

After putting each compound into the blended meal, then it was determined whether it contains organic or inorganic in it. The bacon ranch salad reacted negatively to the solutions. While also being tested on a well-plate and hot-plate, it still remained the same color. Therefore, the blended mixture does not contain any organic substances such as protein. We began our experiment by gathering our materials and began to test the change in the blended mixture by putting a small amount in well…

• 398 Words
• 2 Pages
Improved Essays
• Decent Essays

Lab 4 in Chem 115 has three parts all calculating density. In part one, a 100 mL beaker, a volumetric pipet, and an analytical scale were obtained. To begin, the mass of the beaker was taken using an analytical scale. Then, 10.0 mL of an unknown liquid was transfered to the beaker using the volumetric pipet. Next, the mass of the beaker and liqiud was recorded along with the letter identifying the unknown liquid. By subtracting the mass of the 100 mL beaker from the mass of the beaker and…

• 348 Words
• 2 Pages
Decent Essays
• Improved Essays

Prepare a chart for recording any observations as you test for the presence of cations in the solution. Set up and label 10 test tubes #1- #10 and place them in order in a test-tube rack. Wash and rinse all of glassware with distilled water. Prepare a hot-water bath in a 250 mL beaker by filling it up to 150 ml and bringing it to a boil. Obtain 2 ml of the solution you want to test and pour it into test tube 1. To test the solution for Pb2+ and Ag+ ions, add 8 drops of 6 M HCl solution to…

• 1044 Words
• 5 Pages
Improved Essays
• Improved Essays

Urine and serum samples were transferred to the Chemical Core Analysis Facility of the Occupational and Environmental Health Sciences Institute (EOHSI), Rutgers University. ZEA and its metabolites were measured using an HPLC-MS-MS technique. 0.25 mL sodium acetate buffer (pH=4.65) and 10 μL of β-glucuronidase from Helix pomatia were added into 1mL of urine or serum sample. The enzymatic deconjugation was conducted in a water bath at 37 °C overnight. Then liquid-liquid extraction was performed on…

• 454 Words
• 2 Pages
Improved Essays
• Improved Essays

Procedure: To begin this experiment all of the equipment was collected. The materials used in this experiment were a small plastic weighing dish, oxalic acid, a 250 mL Erlenmeyer flask, distilled water, a buret, NaOH solution, a 150 mL beaker, funnel, and phenolphthalein indicator. Before the experiment began the buret was cleaned with distilled water, a buret brush, and dish soap. The buret was completely washed out in order to not cause any faults in the results of the experiment. Once the…

• 400 Words
• 2 Pages
Improved Essays
• Improved Essays

Buret was rinsed with water and NaOH, and followed by filling with NaOH solution made in the first week of lab. An acid of unknown concentration was prepared by the instructor and given for analysis. 25.00 mL of the acid was transferred into an Erlenmeyer flask using a volumetric pipette and 2-3 drops of phenolphthalein were added. The resulting solution was titrated with NaOH to achieve the faint pink endpoint and [unknown] was calculated according to the volume of NaOH used. The purpose of…

• 504 Words
• 3 Pages
Improved Essays
• Improved Essays

Sterile Saline (0.9% w/v NaCl) Dissolve 9.0gm of NaCl in 1000ml water and dispense 9.0ml of the solution into 20ml test tubes. Autoclave the tubes as per the validated cycle and cool to room temperature. Sterile saline with polysorbate 80: Dissolve 9.0gm of NaCl in 1000ml water and add .5gm of tween 80 to the resulting saline solution, dispense 9.0 ml of the solution into a number of 20ml test tubes. Autoclave the tubes Preparation of Inoculums and its Standardization: 1) Take loop full of…

• 1058 Words
• 5 Pages
Improved Essays
• Previous
Page 1 2 3 4 5 6 7 8 9 21