Laboratory glassware

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…

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…

In this lab, we did four kind of different test, to mimic the chemistry of digestion. The first one was to test for sugar. We used a dropper and measured 2 ml of maltose and 2 ml of benedict’s solution in a pyrex test tube. After, using a test tube holder, we placed the test tube in a boiling water bath and heated for 5 min. After the 5 min, using a test tube holder we removed the test tube from the water bath. We then repeated the same procedure using starch solution instead of maltose. When we…

Reflection Paper Being completely undecided in my career path, and since I have taken all of the available chemistry classes, when the opportunity to job shadow a water operator at the Emlenton Water Treatment Plant arose, I took advantage of it. Even with my knowledge in chemistry, I went into the experience knowing only that they use chemicals, such as chlorine, to treat the water from the river. I came out of the experience with a more selective career path and a much greater knowledge and…

Chlorine is a chemical added to swimming pools to keep the water free of bacteria and algae. Chlorine levels in swimming pools vary based on how much chlorine has already been used to remove bacteria and how much sunlight has broken down the chlorine molecules. This means that pool owners spend a lot of time testing and adjusting the levels of chlorine in their pools. To reduce the amount of time spent on pool maintenance, pool chemical manufacturer's created chlorine tablets. These tablets are…

How to change a cartridge Shower Delta ? The valve cartridge in the Delta Faucet regulates the temperature and controls the flow of water coming into the faucet through a line of hot and cold water. Water temperatures inconsistent, a leaky faucet and the loss of water flow to the shower, all the problems are caused by a cartridge valve for damage and wear. The shower handle is fixed to the front end of the valve cartridge. To remove the valve cartridge, the handle and the rest of the tap is…

2. Experimental 2.1. Materials and reagents Analytical grade bentazon was purchased from Sigma-Aldrich. Acetonitrile, methanol, ethanol, chloroform and acetic acid were purchased from Merck and were analytical or HPLC grade. Methacrylic acid (MAA) as the functional monomer, ethylene glycol dimethacrylate (EDMA) as the cross-linker and α,α′-Azoisobutyronitrile (AIBN) were purchased from Merck (Hohenbrunn, Germany). MAA was distilled under vacuum to remove the inhibitor prior to polymerization.…

We are testing different watt light bulbs and how it affects how fast the chads rise. We are using 300, 200, 100 and 60 watt lights bulbs. We are timing how long it takes for the chads to rise with each different light. Photosynthesis is a chemical process through which plants, some bacteria and algae, produce glucose and oxygen from carbon dioxide and water, using only light as a source of energy. Photosynthesis converts massive amount of Sunlight into electrical and then chemical energy. The…

Methods: To begin, our group acquired three premade vials of .1ml mammal blood with coagulant. We then labeled the vials numbers one, two, and three. In vial number one we added 1 ml of Stock 300 mM NaCl, and no distilled water. This resulted in a NaCl concentration of 1.8 percent. In the second vial we added .5 ml of Stock 300 mM of NaCl, and .5 ml of distilled water. This resulted in a NaCl concentration of .9 percent. In the third vial we did not add any Stock 300 mM of NaCl, and 1 ml…

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…