I inserted the digital thermometer into the test tube and took reading every 30 seconds until the readings remained constant. The readings for the distilled water did not change. I then placed the test tube in the beaker’s ice water bath and set the stopwatch at zero. I carefully stirred the water in the test tube with the thermometer and recorded the temperature of the water at 30-second intervals. Data Table 1: Pure Water Time in seconds | Distilled H2O Room Temp | Distilled H2O Ice bath | 0 | 2431o C | 24.3o C | 30 | | 4.8o C | 60 | | 0.7o C | 90 | | -0.4o C | 120 | | -0.8o C | 150 | | -.10o C | 180 | | -.10o C | Data Table 2: Salt Solution Time in seconds | Salt Water Room Temp | Saltwater Ice Bath | 0 | 20.8O C | 14.2o C | 30 | | 3.0o C | 60 | | 0.2o C | 90 | | -0.3o C |
After sitting for 30minutes this solution stayed the same color. Table 2: Solution Colors Before 30 Minutes of Sitting in a Beaker of Water and After Benedict’s test Solution Content | Initial color | Final color | 15% glucose1% starch | Cloudy | Orange | Distilled water | Clear | Blue | This table shows the colors of the solutions before sitting for 30minutes in the solution of water and IKI and the final color after the Benedict’s test has been performed on the solution. The initial color of the 15% glucose and the 1% starch before sitting in the beaker solution for 30 minutes and before the Benedict’s test was perform was a cloudy white color. After the Benedict’s test was performed on this solution it turned an orange color. The solution in the beaker which was distilled water was clear before the IKI was added and before the dialysis tubing was placed in it.
* Repeat with the rest of the samples. PHASE CHANGE: * In the green ice bucket, scoop a beaker of ice. * Start stirring the beaker of ice * Start recording the temperature of the ice with a thermometer * Weigh the mass of the beaker and record the mass of the ice * Carry the beaker over to the calorimeter with a cup of ice and release it into the cup of 65mL of water already set up for you * Observe the temperature of the ice/water mixture * After the ice has melted all the way, heat up the water and observe the temperature and phase changes as it turns into steam * Record the temperature at which boiling begins * Look at your barometer and record this pressure Data Table: SPECIFIC HEAT OF METALS | Aluminum | Steel | Copper | Lead | Mass of metal (g) | 7.3547 | 20.0685 | 24.06 | 33.1229 | Volume of water (mL) | 100 | 100
• After the flask was heated, I removed it from the heating mantel and allowed it to cool to room temperature. • Next, I poured 15mL of absolute ether and 9mL of bromobenzene into the 250mL flask and waited 5 minutes for any reaction. • There were no signs of reaction after 5 minutes; therefore the lab assistant used a glass stirring rod to crush the magnesium in order to get the reaction started. When this was done, the liquid became cloudy, rapidly bubbling, and the color turned rusty red. • Next, I added 25mL of absolute ether and attached a reflux condenser to the flask.
I then measured hot tap water versus boiling water, and then cold tap water versus water with ice, and recorded the temperature that was read on the thermometer, and then converted the temperature from Celsius (C), to Fahrenheit (F), and Kelvin (K). To understand how to measure mass, the lab required the following material: pen or pencil, 5 pennies, 3 quarters, 4 dimes and a key. Then I used the digital scale to measure the following objects to obtain its mass and recorded the data. For exercise 2, volume, density and concentration, I started off measuring the graduated cylinder to get its mass. From that mass, I was
In this report I will be looking at the effect of temperature in the solubility of sugar (sucrose) in water when it dissolve in different temperature of water and how long it takes to dissolve. I will also use different scientific explanations to support my findings. In order to do this this experiment I have used three different variables which are:- * Independent (temperature) * Dependant( time taken to dissolve) * Control ( volume of solvent and volume of solute) Equipment needed for the experiment is * 100 ml beaker * Sucrose (sugar) * Timer * Tea spoon * Kettle with boiling water * Thermometer * Ice cubes The methods of this experiment are as follows * First I will boil the water at 100 degree and then put the required amount of boiled water in the beaker. * Use thermometer to measure the temperature and record and then add the required amount of solute and start the timer and stirring until it completely dissolves. * Document the time it takes .I will repeat the process three times and take the average amount of time it took for the solute to dissolve in the solvent of high temperature.
Record the initial temperature of the liquid in the calorimeter. Watch the thermometer until maximum temperature is achieved. Weigh out 2.0g of NaOH pellets. Record the temperature of the distilled water in the calorimeter until the temperature is constant then add all of the pellets at once. Gently stir the pellets until the acid is dissolved by shaking the the apparatus.
Once dry, 2.2 mL of styrene were added to the round bottom flask, and an ice bath and mechanical stirrer were placed under the reaction vessel. A total of 6.2 ML of 1.0M BH3-THF were added to the reaction vessel slowly by a syringe. This addition took place over a 30 minute time period. The vessel was then left alone for 50 minutes. After which time, 2.1 mL of 30% hydrogen peroxide was added slowly followed by sodium hydroxide until a pH of 8 was observed.
A stopper was placed on the flask while the mixture was stirring with stirrer for 11/2 hours. After the mixture had been stirred the flask was wrapped in foil and place inside the freezer overnight. After the mixture had been frozen overnight and thawed it was then filtered on a Buchner Funnel and the flask was rinsed with ethanol and recrystallized. To recrystallize, the crystals that were formed after being filtered were redissolved in about 500mL of warm ethanol because of the 4-Chlorobenzaldehyde used, and it was placed in an ice bath. After the crystals were formed they were filtered on a Buchner Funnel, they were let dry over night, and were weighed after they had dried.
Next 3 more test tubes were filled with ~4 mL of the distilled water solution were placed in the same ice bath. Finally, 100mL of Pseudomonas syringae, nutrient bath and Escherichia coli (instead of ionized water) was added to different test tubes and whether there was a phase change or not was recorded. This was treated as the student designed test. Results: In the preliminary test it was determined that when Pseudomonas syringae was mixed with distilled water the solution formed ice crystals. But there