Lab Report Chemistry Lab

Weigh the beaker with water in it, record this value in Data Table 1 and subtract the mass of the beaker to get the mass of the water. Record this value in Data Table 1.

First, I will get my materials and set up the scale and 10 mL cylinder and refraction cell. I will check the size of the graduated cylinder to find out the volume. (LxHxW) That will equal 40.5mL for volume. I will see how much the cell weighs alone, and then I will 0 out the scale to see how much the water weighs. Then I will see how much the water and the cell weigh together. I will do this for the cell and cylinder. I will check to see if the density I calculated is what it is supposed to be at 1.00.

First, we added water to the graduated cylinder to 20 mL. Then, placed the unknown substance in the water, the water increased and measured 25 mL. The volume was determined by subtracting 20 mL from 25 mL. The volume equaled 5 mL for the unknown substance. Next, we filled the water to 20 mL in the graduated cylinder. Then, placed aluminum in the water, the water increased and measured 25 mL. The volume was determined by subtracting 20 mL from 25 mL. The volume equaled 5 mL for aluminum. After that, we added water to the graduated cylinder to 20 mL. Then, placed the zinc in the water, the water increased and measured 22.5 mL. The volume was determined by subtracting 20 mL from 22.5 mL. The volume equaled 2.5 mL for zinc. Last, we added water to the graduated cylinder to 20 mL. Then, placed lead in the water, the water increased and measured 24 mL. The volume was determined by subtracting 20 mL from 24 mL. The volume equaled 4 mL for

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.

First we will find the mass of the empty graduated cylinder to the nearest 0.01gram. Then we will fill the graduated cylinder about halfway to read its volume. After, we will find the mass of the graduated cylinder with the water to the nearest 0.01 gram subsequently, we will calculate the mass of the water alone to the nearest 0.01 gram. Later, we will calculate the density of the water. Finally, we will calculate the percent difference between our experimental value of the density with the accepted value for the density of water using the same equation the was used in the last step of Part

It is also significant to tare the scale to zero when obtaining the weight of certain objects. For instance, I had to tare the scale after I put a beaker half full of water on the scale; by doing this it keeps the weight at 0.0g, then I submerge the object to retrieve the volume. Exact measurements are essential. One must be aware of the upward curve of liquids in the graduated cylinder, and always measure the low point (bottom) of the meniscus. It would be of good practice to measure at eye level, thus insuring a more accurate and precise measurement. In addition, I had to make sure that I used the pipet as opposed to just pouring from a beaker or flask. This also guarantee a more accurate reading, accuracy and precision is vital in measuring.

To begin, measure the mass of a dry empty 10-mL volumetric flask and stopper. This will be recorded to 3 decimal places. Once the first task is accomplished proceed by pouring 10 mL of DI water to the calibration mark on the volumetric flask and measure its mass which can then be discharged for this step. Next, transfer 100 mL of ethanol into a dry 150 mL beaker and through the use of a disposable pipet transfer ethanol from the beaker into the 10 mL volumetric flask until the calibration mark has been reached. Now place the stopper and measure the volumetric flask's mass.

In this experiment the accuracy of the glassware was obtained by comparing the volume taken by that glassware to the volume calculated or the true volume. Equation 1 describes how to calculate the volume after we weight it using the water density. The “corrected volume” which is the difference of both volumes was then obtained after comparison. For each glassware measurement, we perform three trials and average the weight and volume obtained; then we find the error using Standard deviation (Table 5).

In this lab, the density of 20 glass beads were determined using two different methods and the results were compared to see how close the values were to each other. In first method the volume of each individual bead was measured using the diameter of each bead, along with the mass. In the second method the beads we treated as a whole unit. The total mass was measured and volume was measured based on the amount of water that was displaced in a graduated cylinder. Then, the beads were swapped with 20 different glass beads of the same type. The procedure was repeated and the results were compared to the data of the first bead set to look for any systematic errors that may have occurred. During the experiment, the data was

The objective of this lab was to calculate the densities of various objects using different techniques.

Copied the observations table in our notebook. Then recorded the mass of the beaker using the balance and wrote down the measured mass in the observation

The density of water is its mass divided by its volume. In this case, the mass of water was determined by subtracting the final mass of the glassware with water by the initial mass of the glassware without water. The volume was determined by observing closely which line (marked on the sides of each glassware) the water reached and reporting the most precise measurement. Based on the class data, the average densities of water and its standard deviations were: 50-mL beaker – avg: 0.90 g/mL, stand dev: 0.12, 10-mL graduated cylinder – avg: 0.980 g/mL, stand dev: 0.0600, 10-mL volumetric pipette– avg: 0.9800 g/mL, stand. dev: 0.06499, 50-mL burette– avg: 0.969 g/mL, stand. dev: 0.140. The average density of water compares our experimental value to the true value. This means that the closer our values are to the true density of water, which is approximately 0.998 g/mL at 18.89°C, the more accurate our data is. Furthermore, the standard deviation measures how precise our results are with one another.

Despite measuring the same amount of solution for all three volumetric glassware, it was revealed in this experiment that different glassware will give fluctuating recordings due to the different calibrations found within each glassware. It was deemed that the Buret provides the most precise density value among the three glassware utilized in the experiment. The Buret accumulated 0.34 % difference indicating high precision. The least precise data came from the graduated cylinder. The graduated cylinder had a percent difference of 1.37% which was the highest percent difference recorded for the experiment. There are a number

Used a scoopula to take out baking soda and filled three 30 mL test tube with 0.2 g, 0.4 g, 0.6 g, 0.8 g and 1 g using an electronic balance. Put the test tubes in the rack. 4. Filled a tub with water 30 cm and filled water to the 100 mL mark on the graduated cylinder. 5.

In this experiment, The purpose of this experiment is to investigate the measurement of the actual volume contents of volumetric glassware. In the beginning of the experiment, the volumetric glassware should be clean and dry before used. The volumetric glassware, measuring cylinder and pipette should be handled with care and all the precautions were be taken during the experiment was held. This was to ensure to avoid any errors such as parallax error especially while reading water meniscus. This experiment must be repeated three times or more and take the average reading to get more