A voltmeter was used to measure the electrical resistance of different solutions. * Experiment and Observation: The plastic and glassware used in this experiment was thoroughly washed with hot water and rinsed with distilled water. * * Part I: Preparation of Standard Phosphate Solutions 1. 1.0 ppm standard: 1.00 mL of 10.0 ppm phosphate solution was placed in a 25 mL graduated cylinder and diluted to exactly the 10 mL mark with distilled water then poured into a plastic cup labeled 1. Cylinder was rinsed with distilled water.
Materials: 3 beakers Thermometer 3 Alka-Seltzer tablets Stopwatch Mortar and pestle Source of hot water Ice cubes Graph paper Procedures: Hot water- Run water from the hot tap until it is hot as possible Fill beaker with 80 mL of hot water Use thermometer to take temperature of water. Record in data table. Remove 1 Alka-Seltzer tablet from package Drop into the water. Measure the time it takes for the tablet to completely dissolve. BE READY WITH THE STOPWATCH.
Try to rinse the precipitate in the funnel until the pink color is gone 12. Place funnel in the drier provided until it is completely dry 13. Let cool to room temperature 14. Weigh the funnel and record the weight 15. Subtract the weight of the funnel and the filter paper from this weight to get the weight of the precipitate Results: wt.
Test for Triiodide ion Triiodide is present if your tincture is a shade of orange or red-brown. The solution became an orange-red color which indicates that there is a good amount of triiodide ion present. Standards Test Positive Positive (contains Iodine) Positive Positive (contains Iodide and Chloride) Positive Positive (contains Triiodide) Focus Questions 1. How can I make a Pharmaceutical Product from Seaweed? First of all, a pharmaceutical product can be made from seaweed by heating seaweed in water.
EXPERIMENT ( 3 ) Topic : The preparation of Phenyl Benzoate from benzoyl chloride Introduction : The preparation of phenyl benzoate (ester) from phenol and benzoyl chloride is an esterification. In this experiment, you are requested to prepare and purify phenyl benzoate by some techniques. Chemicals : Phenol, Benzoyl chloride, Dilute NaOH, Methanol Procedures : 1. Dissolve 1 g phenol in 15 cm3 dilute NaOH using a 50 cm3 quickfit flask. 2.
Chem. 317 Title: The Synthesis of Chloropentaamminecobalt(III) chloride and Linkage Isomerization to Further Synthesis Pentamminenitrocobalt(III) chloride Experimental: Ammonium chloride (.0467 mol) was diluted in concentrated aqueous ammonia (15 ml) in a 125ml Erlenmeyer flask. CoCl26H2O (.0210 mol) was then added to the ammonium chloride solution. The ammonium chloride solution was heated and stirred while 30% hydrogen peroxide (4 mL) was added drop wise. The reaction was monitored and removed from the heat once the effervescence ceased, and then was allowed to cool.
Experiment 2 Time | Observations | 5 minutes | Bubbled like sugar | Once salt water was added | Turned soapy white and thick | Equation: METHOD 1) Put 2 cm3 of castor oil into a 250 cm3 beaker and add 10 cm3 of 5mol.dm-3 sodium hydroxide from a measuring cylinder. (Take care when measuring this out and adding it to the beaker to avoid any drips and spills.) 2) Heat the mixture gently over a tripod and gauze, STIRRING CONSTANTLY with a glass rod (otherwise the mixture erupts). Allow to simmer (boil gently) for 5 minutes. Steady the beaker using
White precipitate shows the presence of chloride (Cl-). Chloride anion equation: HCl(aq) + AgNO3 (aq) → HNO3 (aq) + AgCl(s). The nitrate anion test involves cooling a mixture containing 1 mL of test solution and 3mL 18M H2SO4. 2mL is poured down the inner test tube side and the presence of a brown ring shows nitrate (NO3-) to be present. The carbonate anion test mixes 1 mL of test solution and drops of 6M HCl.
Calculate the molarity of the original vinegar solution and its concentration in gdm-3, given that it reacts with NaOH in a 1:1 ratio. 7. 2.5 g of a sample of ethanedioic acid, H2C2O4.nH2O, was dissolved in water and the solution made up to 250 cm3. This solution was placed in a burette and 15.8 cm3 were required to neutralise 25 cm3 of 0.1 moldm-3 NaOH. Given that ethanedioic acid reacts with NaOH
Use 10 mL of the stock and dilute to 1 L with distilled water. This gives a 0.01 M solution. 7. Yeast suspension: Add 1 package of dry yeast to 250 mL of 1% sodium bicarbonate solution. Mix thoroughly and swirl when dispensing.