Fill the calorimeter cup approximately 2/3 with distilled water at room temperature and record the mass in Data Table 1 5. Measure the temperature of the tap water in the calorimeter cup and record in Data Table 2. 6. Carefully transfer the metal to the beaker with boiling water. Boil at least 10 minutes.
25 ml of diluted unknown acid solution to 100ml beaker by using 25 volumetric pipet. 10ml of deionized water and 3 drops of phenlpthalin indicator the beaker labeled as 3. Potentiometric titration acid solutions 125 ml of NaOH was obtaining in a beaker and 50 ml of NaOH transfer to buret the tip and the meniscus is at below 0 ml. one magnetic stirring bar placed in a beaker contain one of the known solution on a stir. The pH recorded by using pH electrode before adding NaOH.
First I made a water bath by filling the 100 mL beaker with cool tap water. I then placed crushed ice in the 100 mL beaker so the water level was just below the top of the beaker. I sprinkled a little salt in the ice water and mixed it well. I then filled the test tube half full with distilled water and set the test tube in the 24 well plate. I inserted the digital thermometer into the test tube and took reading every 30 seconds until the readings remained constant.
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.
A melting point will be ran on the aspirin when completely dry. A capillary tube containing the dry aspirin will be placed into the melting-point apparatus. This process is to determine the melting point range of aspirin. First, a hot water bath was created with a 400. mL beaker on a hot plate. The temperature was raised to 70 degrees Celsius and 4.419 g of salicylic acid was measured out on a balance and transferred into a 125. mL Erlenmeyer flask.
c Use the syringe to place 2 cm3 of amylase into the test tube. d Add 1 cm3 of buffer solution to the test tube using a syringe. e Use another syringe to add 2 cm3 of starch to the amylase/ buffer solution. Start the stop clock and leave it on throughout the test. Mix using a plastic pipette.
Purpose: To observe freezing point depression and Osmotic pressure Materials: Student Supplied – Karo Syrup, Salt, Distilled water, Vinegar, Egg, Ice, Glass, Measuring spoon LabPaq materials: Test Tube, Thermometer, 100mL plastic beaker, 24-well plate Procedure: Start the Osmotic Pressure procedure several days before the due date! Freezing Point Depression 1. Place ice water in 100mL beaker, up to the 100mL mark. (not precise) 2. Add “some” salt to the ice water.
Materials: 15 ml of 1% Glucose Concentrate 15 ml of 5 % Glucose Concentrate 15 ml of 10% Glucose Concentrate 15 ml of 15% Glucose Concentrate 2 400 ml beakers 1 100 ml beaker Water (at least 2-3 L) 216 cm of dialysis tubing 10 ml graduated cylinder 48 glucose test strips Safety Goggles Ruler Scissors Procedure: 1. Create a data table for the experiment. 2. Put on your safety goggles. 3.
Allow the crystals to dry for 1 week then, weigh it, take a MP, and calculate the % yield. * Assemble the apparatus for reflux using the diagram (see figure 1), place boiling chips or a stirring bar in the bottom of the flask. * Weigh 2grams of finely ground nutmeg and combine with 10ml of diethyl ether in a 50ml round bottom flask. * Place a heating mantle under the round bottom, turned on and the heat was slowly adjusted until the mixture starts to boil for 45minutes, then let cool to room temperature by sitting it on the lab bench. * Pour a little ether over the nutmeg residue on the filter paper so that any Diethyl ethanol traces clinging to it is washed down and mixed with the filtered liquid underneath.
Aim To measure how much antacid is needed to neutralise some hydrochloric acid. Hypothesis It takes around 1.5-2.5 grams of Antacid to neutralise 50mL of Hydrochloric Acid. Materials Dilute Hydrochloric Acid (HCI) 0.1M Small Flask (250mL) 50mL measuring cylinder Methyl Orange indicator Spatula/Spoon Plastic petri dish Scale White piece of paper Antacid powder Method Get approximately 10-15 grams of antacid and put it in the petri dish and write down your measurements. Also get a measuring cylinder and put in 50mL of diluted hydrochloric acid. After measuring out the Diluted hydrochloric acid in the cylinder, pour it out into the flask and add 3-5 drops of methyl orange.