Record the mass of thyme used. 2. Using a measuring cylinder, add 50cm3 of 1.0mol dm-3 sulphuric(VI) acid and boil gently for 5 minutes. 3. Allow the mixture to cool for a few minutes then filter it, using either gravity or vacuum filtration.
Gently stir the resulting mixture for 30-60 seconds. * Step 4 –Place a suitable filter (cloth, filter paper or a fine sieve) over an empty glass, and secure it with the rubber band. Pour the mixture into the filter. If the mixture is too thick, stir in more of the extraction solution. Leave to filter for about 10 minutes.
The extraction process is when a solvent, dichloromethane (15mL) is added to the filtrate in a separatory funnel; the mixture is gently swirled together 3 times, and stopcock is released in between to vent the funnel. Dichloromethane (including the emulsion) is then drained from the bottom into a 50mL Erlenmeyer flask. Same extraction process is repeated on the same filtrate and the dichloromethane is, once again, let out to the same 50mL Erlenmeyer flask as before. The combined dichloromethane solution and water (20mL) is poured into a rinsed separatory funnel. Mixture is gently swirled and drained out into an Erlenmeyer flask.
Gravimetric Determination of Sulfate Purpose The purpose of this lab is to determine the percentage of sulfate in the hydrate by precipitating the sulfate as barium sulfate. Materials Filler paper Sodium sulfate Graduated cylinder Bunsen burner Watch glass Beakers (250 mL, 400 mL) Rubber bulb Graduated pipette Beaker tongs Funnel Filter Paper Sodium Sulfate Drying oven Wash bottle Stirring rod Silver nitrate Hydrochloric acid Distilled water Small test tube Procedures First, .4861 grams of sodium sulfate was placed into a clean 400mL beaker. Exactly 200mL of water and 1mL of HCl was added to the same beaker. A watch glass was placed on the beaker and the solution was heated using the Bunsen burner to a gentle boil. The watch glass was removed with the beaker tongs.
Do this one more time the exact same, and then a third time using only 10 mL of the mixture. Each of the three times you do this, extract the liquid. Transfer the liquid into the large 100 mL round bottomed flask that is connected to your simple distillation set up. Distill the tomato paste liquid. Once it is completely distilled, remove your filtered material and add 2 mL of dichloromethane.
Pour about 80 mL of NaOH solution into the BASE beaker. Record the NaOH concentration. 3. Prepare the burette as follows. Hold the burette in one hand and pour about 5 mL from the BASE beaker into the burette.
After 10 seconds, the colorless mixture suddenly turns blue. Concept: Demonstrates a typical clock reaction; shows the effect of the interaction between chemical reactions that have different rates. Materials: • Solution A o 0.6 grams Starch o 30 mLs of Acetic Acid o 4.1 grams of Sodium Acetate o 50 grams of Potassium Iodide o 4.7 grams of Sodium Thiosulfate ▪ Allow mixture to cool and dilute to 1 liter with distilled water o 1 liter flask • Solution B o 500 mLs of 3% Hydrogen Peroxide o 500 mLs of distilled water o 1 liter flask o Safety: Hydrogen Peroxide can be irritating to skin and eyes. Wear safety goggles and gloves. Procedure: Mix the two solutions together.
This drink is best served in a glass jar with the strawberries and basil leaves floating on top. Ingredients • 1 cup basil leaves • Tea bags • 4 cups Boiling water • 10 large strawberries (chopped) • Crushed ice Instructions • Place the tea bags in the boiling water and discard them after 15 minutes • In another container, boil 1 cup water along with the basil leaves and some sugar. Simmer for 10 minutes. • Remove this container from the fire and add the strawberries. Now refrigerate until chilled.
A 125mL Erlenmeyer Flask was used to combine (15mL) of concentrated aqueous ammonia and ammonium chloride (0.0467mol, 2.49g). The mixture was stirred till fully dissolved. Colbalt (II) chloride hexahydrate was ground (6.2g) and added in small amounts to the stirring solution (0.0210mol, 5.2g). As the mixture continued to stir (4mL) of 30% hydrogen peroxide was added drop wise to yield a dark warm slurry. After the effervescence, (15mL) of concentrated HCl was added drop wise to the solution.
Independent Variables: • The range of pH, between 6-8 pH. Method: 1. Firstly, place the buffer tablets into a test-tube containing 20 ml of water (at room temperature). 2. Once the buffer tablet has dissolved into the water, add 10 ml of starch solution.