Acetic anhydride

Hydrazine (N2H4) is a colorless, oily liquid that has an odor similar to ammonia. Other names for Hydrazine include Diamine, Nitrogen hydride, Diazine, and Levoxine. Its molecular weight is 32.05 g/mol and it is miscible in water. Its boiling point is 113.5 degrees Celsius at 760 mm Hg and its melting point is 2.0 degrees Celsius. Most people can smell hydrazine when present at concentrations of 2.0–8.0 parts per million (Choudhary G). “It is known for its corrosive and strong reducing…

Materials and Procedure The materials that were used were the following: 4.268 grams of zinc sulfate heptahydrate, 2.586 grams of calcium acetate monohydrate, Analytical balance, 220 milliliters of deionized water, stir stick, two 100 milliliter glass beakers, one 250 milliliter glass beaker, filter paper, ring stand, glass funnel, and an Erlenmeyer flask. All of the materials listed above were obtained or taken into consideration before experimentation began. A piece of weight paper was…

There are two methods you can use to find out how porous your hair is: A. The Float Test: Take a couple of strands of hair from your comb or brush and drop them into a bowl of water. Let them sit for 2-4 minutes. If your hair floats, you have low porosity. If it sinks, you have high porosity. B. The Slip'n'Slide Test: Take a strand of hair and slide your fingers up the shaft (toward the scalp). If you feel little bumps along the way, this means that your cuticle is lifted and that you have high…

Safety Glass is used in every experiment and was always handled carefully, especially when being heated. If a glass object was dropped, the teacher was immediately notified so that the proper cleanup procedure could be done. Hot plates and lamps get hot quickly, so when I was working with them I made sure I did not touch them. In many of the experiments possible eye and skin irritants such as ZnCl₂ as well as toxic materials like HCl are used. Materials such as these should be handled with…

Purpose: The purpose of the lab was to identify a powder based on its physical and chemical properties. Materials & Apparatus: -eye protection -well plate -pipette -small toothpick/ paper clip for stirring -6 white powders: icing sugar, cornstarch, Aspirin powder, baking powder, mystery powder -test solutions in dropper bottles: water, universal indicator, vinegar, iodine solution Safety notes: Aspirin Powder- in case of contact with skin, wash with soap and water. Universal indicator- toxic…

Analysis: Draw a quick sketch of the chromatography paper and the positions of the different pigments relative to original line where you put the spot of leaf extract. (Bazil) Which pigment is the most soluble and which is the least soluble in petroleum ether? Each pigment has a different solubility in the solvent due to their unique molecular structures and differing polarities. Solubility plays in an important role in determining unknown pigments in a sample. In the case of the lab, the most…

To begin the reaction,1ml of acetic acid was added to 0.1g p-dimethoxybenzene and 0.20ml of t-butyl alcohol in a test tube. The solution was mixed and placed in an ice bath. Approximately 34 drops of sulfuric acid from a plastic pipette dropper was slowly added to the solution. The…

Purpose: The purpose of this lab is to establish a concrete understanding of limiting reagents and percent yields. In addition, the lab should give the administrator the ability to analyze the effects of reactants on the product of a chemical reaction. Procedure: In part A of the lab, the first step in the procedure is to add 20 mL, and 25 mL of CaCl2 to two different flasks. Following this, the administrator is to add 10 mL of Na2CO3 to the flask containing 20 mL of CaCl2, and 5 mL of the…

The purpose of this lab was to identify the amount of salt needed in the water to “flink”, the point at which an object sinks or floats, the golf ball in a salt solution. Flinking occurs when the object is neither sinking or floating, it appears as if it is suspended in the middle of the solution. To flink an object, the object’s density has to have the same as the density of the solution that it is placed into. To achieve the same density of both the salt solution and golf ball, manipulation of…

Two chromatographic methods were developed for the assay of the FDA approved lozenges containing dextromethorphan hydrobromide (DXT) and menthol (MNT). The first was a green HPTLC method which depends on using Merck HPTLC aluminum sheets of silica gel 60 F254 and methanol-ammonia (10:0.1, v/v) as mobile phase. This was followed by densitometric measurements of the spots which were retained at 0.28 ± 0.01 for DXT and 0.76 ± 0.02 for MNT scanned at 210 nm. The method was found linear over the…