b) When pouring agar into the petri dish, pour just enough to fill the dish about half way. c) Although you must work fairly quickly, pour the agar gently to minimize the number of bubbles (bubbles look amazingly similar to colonies when the agar hardens). 4. When you are ready to pour: a) Pull out the container of DMA and remove the cap. b) Open the cover of the petri dish halfway and pour in the agar to just cover the bottom of the dish.
To make a swirl, pinch the center of your fabric while it is flat on the table. Begin to twist the fabric but be sure not to lift it up off of the table. Twist until the shirt makes a circle. Secure it with rubber bands. I use two or three bands to keep the fabric from loosening or moving around.
While the flask cools, a vacuum filter is assembled using a Büchner funnel. Next, 150 ml of saturated sodium chloride solution is added to the flask. After filtering the soap is dried and weighted. In the next part of this experiment the precipitation and emulsification properties of both soap and detergent are compared. First ~2 g of the previously prepared soap is dissolved into 100 ml of boiling distilled water.
Please remember to follow all safety precautions, such as wearing gloves and eye protection in case the fiber should break as shown in the picture below: (Cables plus, n. d.) There is also an oven-cured epoxy method that follows different steps: The epoxy is injected into the connector and then the connector is assembled. Step 1: Turn on the curing oven and set the temperature as recommended by the epoxy manufacturer. Step 2: Mix the epoxy according to the
The beaker was then moved to a stir plate with a stir bar and held in place by a ring stand. A funnel attached to an aspirator hose was fixed above to serve as a fume hood. With the aspirator and stir plate both on, 4.79 mL of 6 M HNO3 was added slowly to the beaker until the copper dissolved and the solution turned a light blue color. The hood could now be removed and 10.02 mL of distilled water was added to the solution. While stirring, 6 M NaOH was added drop-wise until the solution became basic, turning red litmus paper blue.
Materials and Methods Materials The compounds used in this lab are listed in the table below: Procedure We boiled 2 NoDoz tablets in grinded form with 60 mL of water in a 100 mL beaker and allowed it to cool to room temperature after it had been sitting on the hot plate for 5-10 minutes. Next, we performed a hot gravity filtration by pouring the hot aqueous solution of water and NoDoz (caffeine and insoluble binder) through a large Buchner funnel into an Erlenmeyer flask. We discarded the collected insoluble binder collected inside of the Buchner funnel and performed an extraction by mixing the aqueous solution collected in the Erlenmeyer flask (aqueous solution of water and caffeine) and 15 mL of methylene chloride in a separatory funnel and swirled until the layers had separated to form an aqueous layer on top and an organic layer containing the solvent and caffeine at the bottom of the funnel. We drained the lower layer into an Erlenmeyer flask and repeated the extraction. Next, we added anhydrous sodium sulfate to the Erlenmeyer flask, which contained the combined organic layers of the 2 extractions,
The extrusion is trimmed and annealing is essential to soften the material so that it can collapse without cracking. Printing can be carried out before the filling of the tube with the product and requires the use of very flexible coatings, while the application of the label can also be done after, although it is difficult. After filling the tube, the end is rolled over and crimped using a matrix which adds date and product code. Screw caps, dispensers or other fittings are added before filling, for tubes with open neck, and after on products that must be opened by puncturing a seal in the neck. In some cases an inner coating is necessary to protect the interaction of the product with the metal.
In water-based fluids, water quality plays an important role in how additives perform. Temperature affects behavior and interactions of the water, clay, polymers and solid in the mud. Downhole pressure must be taken into account in evaluating the rheology of oil muds. Viscosity is another important properties of mud that we must know. Viscosity of fluid by definition is its resistance to flow.
DENSITY OF ANTIFREEZE- WATER MIXTURES In this experiment, several mixtures of water and ethylene glycol (the major component of ‘’antifreeze’’) will be prepared and their densities measured. A calibration curve will be generated by plotting density versus percent antifreeze, and this curve will be used to determine the composition of an ‘’unknown’’ sample mixture. WARNING: ethylene glycol major component of antifreeze is a sweet tasting, poisonous liquid. Avoid unintentional ingestion by following standard laboratory safety measures. Step 1using a clean 10-ml pipet, transfer precisely 4.00, 3.50, 3.00, 2.50, and 2.00 ml of tap water to five separate test tubes.
The watch glass was removed with the beaker tongs. Using a rubber bulb and a stirring rod to stir the solution continuously, 15.00mL of .25M BaCl2 solution was added to the solution in the beaker. The watch glass is replaced and the solution is keep hot but not boiling for 15 minutes. The precipitate was allowed to settle. When the liquid above the precipitate was clear, the solution was tested for completeness of precipitation when a few drops of BaCl2 solution were added from a pipette.