Vernier Gas Pressure Lab Report

1. Move the lid of the container up or down. Record the resulting volume and pressure

In this lab experiment our main focus was to get skillful in using tools such as the metric ruler, balances, thermometer, and graduated cylinder to capture measurements of length, mass, temperature and volume. Additionally, this lab helped us to become more familiar with the uncertainty of measurements, as well as becoming efficient with rounding our measurements to the correct numbers of significant figures. Our results are measured consistently with rounding to the closest answer we could possibly acquire as the data can tell you.

To start this experiment, set up the gas collecting apparatus. To start Part A, add approximately 15mL of distilled water to the test tube and record the temperature. Use about half of an Alka-Seltzer® tablet and record the mass. Close the test tube with the stopper with the tubing and tilt the test tube so the water and tablet react. When the reaction is finished, record the volume of CO2 recovered by lining the meniscus of the graduated cylinder up with the water level.

1) Select a 60 mL Syringe Sealed from the Gas Syringe item under the Equipment menu. Set the volume to 20 mL in the Initial Gas Syringe Volume dialogue box.

Put room temperature water into the tray up to the marked line inside. Place a ruler across the width of the water bath and insert the respirometers so that the pipets rest on the ruler. If the vials float on top of the water bath, place a heavy object that would allow the tubes to fully submerge into the water. 7. Wait 5 minutes for the respirometer to change into a similar temperature as the room temperature water.

Then use a thermometer to determine the water temperature and record it in the data table 4. At the end of 7 minutes, submerge each of the tubes entirely in the water bath. Some water will enter into the pipette very slowly from the blunt end. 5. If your respirometers float, you may need to weight them.

Before beginning an experiment, it is good to calibrate any equipment that needs calibration. This ensures that results obtain will be as accurate as possible or as near to the true value. All equipment should be inspected to ensure that there are no chips, cracks or general damage to the equipment as these could cause problems during the experiment which could affect the overall results gained. Equipment such as burettes, pipettes, flasks and beakers must be rinsed with distilled water to get rid of any impurities in the equipment. If solutions are to be poured in any piece of equipment then the equipment should also be rinsed out with the solution being used, this will maintain the pH level in the instrument. Once a solution is transferred from the pipette to the flask, touching the tip of the pipette on the side of the flask will drain any extra drops that may still remain on the tip of the pipette.

Hang the temperature probe in the hanging soda can and make sure the probe is hanging in the water and not touching the bottom of the can or the side of the can, one method of hanging the probe is using another ring above the original ring on the ring stand and drape the wire on the upper ring to let it hang in the water in the soda can dangling on the lower ring stand. Now, grab the matches and pick you the piece of food and prepare your timer and to start the

Both the orifice and the Venturi meters produce a restriction in the flow and measure the pressure drop across the meter. The velocity of a fluid is expected to increase as the fluid flows from an open area, to a more constricted area. Assuming incompressible flow, a negligible height change, and steady state, Bernoulli’s equation can be simplified to show the correlation between the volumetric flow rate and the pressure drop. The equation for both meters is as follows:

The next step in this lab is to rinse the Erlenmeyer flask with distilled water down the drain and then repeat the experiment, this time adding 10 ml of 0.10M KI and 10 ml of distilled water to the flask instead. The flask should again be swirling to allow the solution to succumb to the same temperature as the water bath and once it has reached the same temperature, 10 ml of 3% H2O2 must then be added and a stopper must be immediately placed on the flask and recording should then begin for experiment two. After recording the times, the Erlenmeyer flask must then be rinsed again with distilled water down the drain. After rinsing the flask, the last part of the lab can now be performed. Experiment three is performed the same way, but instead, 20 ml of 0.10 ml M KI and 5 ml of distilled water will be added and after the swirling of the flask, 5 ml of 3% H2O2 will be added. After the times have been recorded, data collection should now be complete.

Experiment/Result/Analysis: In activity 17.8.1, we related volume and temperature, we had a empty beaker with air and a temperature probe in it, sealed with a rubber stopper that was connected to a syringe. We placed the beaker in cold water with a immersion heater and recorded the data on LoggerPro. As the water heated up, we observed that the pressure of the air remained constant because the temperature is also changing. We fit our data with a linear curve and concluded that the change in volume is directly proportional to the change in temperature.

I chose to use the gas syringe as it is very appropriate and accurate, allowing me to measure the gas volume to an accuracy of 0.5 cm3. My choice in using the gas syringe as a measurement tool allowed me to ensure my results were accurate and precise.

The volumetric pipet was the most accurate and precise, while the Erlenmeyer flask was the least accurate and the least precise. The graduated cylinder was much more accurate than the Erlenmeyer flask, but not quite as accurate as the volumetric pipet. In part two, 5mL of water and 5mL of isopropyl alcohol were mixed in attempt in attempt to answer the question ‘are the volumes of two pure substances additive?’ According to our data, no, they are not additive. When mixed, the results consistently came up at least .08mL shorter than what was

8. Create a graph: Select the GRAPH tab. Set the mass slider to 0 kg, and click Record to plot a point on the graph. Plot a point for each possible mass to create a graph showing the relationship between pressure and volume.

Place the beaker on the hot plate, place the thermometer in the beaker and set the hot plate to 5oC.