In our first Chemistry lab, I was tasked with using volumetric tools and devices in order to find the density of water, a sugar solution and determining the amount of beads within a container while maintain the appropriate significant figures. The main skill goal of the experiment was to gain knowledge on the use of volumetric measuring tools such as beakers, graduated cylinders and volumetric pipets. This experiment was designed for us to learn how chemistry lab equipment is used and maintained, while also giving us the opportunity to use this equipment in several uniquely designed experiments. This makes the experiment very useful in our knowledge of how scientific labs operate and how chemistry experiments are conducted through the proper …show more content…
The first instrument I used was a beaker, the second was a graduated cylinder and the last was a volumetric pipet. Each of these instruments was used to attempt an accurate measurement of 10mL of water and then weighing the water on an analytical balance to find the density by dividing the weight over the volume. I knew the density of the water at a certain temperature and compared that to my data to see which was most accurate. The next part of the experiment was to find the density of a sugar solution. I did this by mixing a certain mass of sugar with a certain volume of water until it reached a solution of 50mL. I then obtained 10mL of this solution with a volumetric pipet and put it into a vial and weighed the mass of the solution 3 times. The average was then placed over 10.00mL to obtain a density calculation of the solution. The final part of our experiment was to estimate how many beads were in a certain container through the use of an analytical balance and a top loaded balance. Each balance has a different uncertainty in its ability to weigh accurately and we were tasked with finding out which device would be more accurate. I performed this experiment by taking the total mass of the container, the mass of 1 bead, the mass of 10 beads and the mass of 20 beads on each balance and then using arithmetic to calculate the total number of beads at each interval and create an estimate to how many beads were in the
Procedure: Measure the volume, mass, length and temperature of a variety of items. Create dilution of sugar water.
Procedure: I used a ruler, thermometer, and scale to take measurements. I used a graduated cylinder, short step pipet, scale, and ruler to determine volume and density. I used a volumetric flask, graduated pipet, pipet bulb, scale, and glass beaker to determine concentrations and densities of various dilutions.
Experiment 2 “Density” was about how to measure the mass and volume and determine the density of water, alcohol, and a solid. For this lab, we begin by calculating the mass of empty graduated cylinder and the mass of 25 mL of tap water. After taking the mass of water and cylinder, we record it on “Density of Water: Data Table”. Since we did not have enough time of complete the whole lab, so we skipped the procedure to measure the density of alcohol. We jumped to the next procedure, which was density of a solid. For that we used a copper and it density 8.95. For this lab, my partner and I did not make any mistakes or errors. But, for better improvement I think we should have more time to complete the whole lab. I felt like we was rushing through
Procedure: Using distilled water, premeasured containers and objects determine displacement of fluids and density of objects. Use ice and heat measure temperatures in Celsius, Fahrenheit and Kelvin.
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.
Introduction: Accuracy and precision were the major aspects of the lab. Accuracy is how close the average of the measured values are to the actual value. Precision is the closeness of repeated measurements. In the lab, the aim was to get as close as possible with both accuracy and precision when determining the mass and volume of the spheres. The mass was determined by weighing the spheres on the Analytical Scale and Triple Beam Balance Scale. The volume is determined by measuring with a ruler and by water displacement. The standard
In the third stage of this experiment, the density of a liquid was determined and compared to known standards. A 100ml beaker was filled to about half-full with room-temperature distilled water. The temperature of the water in ◦C was recorded in order to compare to known standards later. A 50ml beaker was then weighed on a scale in order to determine mass and recorded. A sample of the distilled water with an exact volume of 10ml was then placed in the 50ml beaker using a volumetric pipette. The 50ml beaker with the 10ml of water was then weighed again and the initial mass of the beaker was subtracted from this mass to obtain the mass of the 10ml of water. With the volume and the mass of the water now known, density was calculated using d = m/V and recorded in g/ml. This process was then repeated to check for precision and compared to standard values to check for accuracy. Standard values were obtained from CRC Handbook, 88th Ed.
It used mass, temperature, length, volume, density, and making a dilute solution. I learned the importance as well as the difficulty of making proper measurements in a lab setting. If one measurement is off, it will throw the entire equation off. This will give either incorrect or inaccurate results.
The weight of each 50ml beaker (used for weighing the mass of dissolved Potassium chloride after the evaporation of water) should be recorded. If the experimenter were to weigh the mass of one beaker and take it as a default mass, the latter may be a source of error.
This is done through a change in temperature. Over time, two objects that are in direct contact will
The volume of a small test tube and a thin-stemmed pipet were determined in this section of the lab. Water was poured into a small test tube until the water reached the very top edge of the test tube. The test tube was then emptied into a plastic 25 mL graduated cylinder and volume was measured and recorded into data table 3. A think-stemmed pipet was completely filled with water. Drops were carefully counted and emptied into the empty plastic 25 mL graduated cylinder until the water level reached 1 mL. The number of drops in 1 mL was recorded into data table 3. The thin-stemmed pipet had a total volume of 4 mL and that was also recorded into data table 3.
The purpose of this lab is to learn how to perform a lab, to learn how to measure mass and volume, to understand additive and non-additive properties, and to define density.
Pour 5 mL of water into the graduated cylinder. Weigh and record the mass of the cylinder and water.
4. Prepare a vacuum filtration apparatus using a buchner funnel. Obtain one filter paper for each one of your samples, weigh them and record their mass in your notebook (label them with a pencil to be able to differentiate them later).
A volumetric pipette & measuring cylinder can be calibrated by just weighing the water they deliver. As for volumetric flask, the weight of an empty flask is recorded. Next, weigh the flask after filling it with water to the mark.