11.Repeat procedure again. Part Two 12.Use the thiosulfate to refill the 50 mL buret. 13.In a Erlenmeyer flask, add 1 mL of bleach. 14.Add this Erlenmeyer flask to 25 mL of distilled water. 15.Dissolve 2g of KI in the flask.
2. Using the funnel, fill dialysis sacs with approximately 20ml of the specified liquid. Sac #1 and #2 filled with 40% glucose solution, sac#3 – 10% NaCl solution and sac #4 filled with 40% sucrose solution. They have to be weighted (data chart on table 1) and then each of the sac dropped into particular corresponding beaker. Sac #1 placed into beaker #1 with distilled water, sac #2 placed into beaker #2 with 40% glucose solution and so forth.
Pour all the filtrate and washings into a 250cm3 volumetric flask. Make up to 250cm3 with 1.0mol dm-3 sulphuric acid(VI) acid. Stopper the flask and invert several times to thoroughly mix the solution. 5. Fill the burette with 0.005mol dm-3 potassium manganate(VII) solution.
» 2 Bunsen burners »2 tripods » 2 wire gauzes » 2 × 150 mL beakers » 2 × 250 mL beakers for 70°C and 80°C water baths » 5 Styrofoam cups for unheated water baths » 8 thermometers 0–100°C » 16 test tubes in a rack » 10 mL measuring cylinder » junket tablet » 50 mL milk » Crushed ice » dropper » plastic spoon » marking pen » Distilled water Note: Thermostatically controlled water baths may be used if available. Method 1 Prepare half-filled water baths by mixing different amounts of tap water, boiling water and ice in the styrofoam beakers to give one of each temperature: 10°C, 20°C, 30°C, 40°C and 50°C. Maintain the 70°C and 80°C temperatures by placing water in the beakers on the Bunsen burners and adjusting with cold water as necessary. Alternatively, use thermostatically controlled water baths for the 30°C, 40°C, 50°C, 60°C, 70°C and 80°C experiments. Place thermometers in each water bath to record the actual temperature in each bath.
After the effervescence, (15mL) of concentrated HCl was added drop wise to the solution. The mixture was then heated for 15 minutes in a boiling water bath. In two separate small beakers (20mL) of distilled water was placed in one and (20mL) of 6M HCl in the other. Both beakers were placed into an ice bath. After heating, the mixture was cooled to room temperature and filtered by vacuum filtration into a fritted funnel to yield a purple product.
We then reduced the water in the beaker to 50mL of cold tap water and introduced ice to bring the volume near the top of the glass beaker. The water-ice mixture was gently stirred with a glass thermometer and the temperature recorded was -1⁰C (See Table 3). Table 3. Cold Temperature Measurements. Volume Measurements See Figure 1 for the sketch of our meniscus in our 25 mL plastic graduated cylinder with 12.5 mL of tap water in it.
Materials: 250mL Beaker Test Tube Calorimeter Burner, Ring Stand, and Wire Gauze Thermometer Balance Procedure: 1. Prepare an appropriate data table. 2. Fill the 250mL beaker about half full. Place it on the stand and begin heating it to the boiling point (100 degrees Celsius).
Take the fine soil from the bottom pan of the sieve set, place it into a beaker and add 125mL of the dispersing agent. Stir the mixture until the soil is thoroughly wet. Let the soil soak for at least ten minutes. 2. While the soil is soaking, add dispersing agent into the control cylinder (Sodium Hexametaphosphate 125ml) and fill it with water to the mark.
Apparatus: • Safety glasses • Bunsen burner • Heat proof mat • Sodium thiosulphate • Hydrochloric acid • 100 ml of conical flask • Stop watch • 50 ml measuring cylinder • 10 ml measuring cylinder • Distilled water • Ice • Apron • Beaker Method 1. Collect safety equipment (apron and safety glasses) 2. Collect all materials and apparatuses 3. Set up the practical for room temperature test. 4.
After that, dissolve the sample in 2 mL of deionized water and shake the test tube for 1 to 1 ½ minutes to dissolve the solid. Place another dry test tube in a 50mL beaker and weigh it. Find a bottle of barium iodide and record the name and molar mass. Then, weight out either anhydrous barium iodide or barium iodide dehydrate into this test tube and dissolve is it in 2 mL of deionized water. Pour the contents of one of the test tubes into the other and a reaction should occur and you should see a white precipitate of barium sulfate form.