We carefully slid the unknown solid into the cylinder with water. We then recorded the new volume and subtracted the two recordings equaling the volume tot the unknown. 4. We then calculate the density by dividing the mass by the volume. S, We then remove the metal cylinder, dry it and repeat to get the other two densities. Then record the measurements and density for each trial and then average the densities,
Part 2: Calibration of a Burette 1. Get 4 small beakers, clean and dry them, then record the mass of each. 2. Get gamma; Pill the burette past the zero mark. 3. Measure 10, ml of water from the Burette separately into the four small beakers. 4. Measure and record the combined mass Of the beaker and the water 5. Then we determined the actual volume fatter by using the mass of water in the beaker, table densities, and the equation: volume equals mass over density. 6. We then calculated and recorded the absolute error and percent error for each volume.
Part 3: Calibration of Pipette 1. Obtained a beaker and measures its mass. . Draw a sample of water into the pipette above the calibration mark, then quickly replaced the bulb on top on the pipette with my hand to prevent any water coming out past the calibration mark. 3. Then we emptied the water into the b eager 4. Measure the mass of the water and the beaker S. Then we calculated the volume again by diving the mass by the density, 6. Repeat the same procedure two more times then calculate and record the absolute and percent error for each volume.
In part 2 results showed that the greater the volume the lower the percentage error was. In part 3 we calculated that the average volume was 5. 102 and the percentage error was 2. 05. In part 4 we learned that after 3 trials the density of the unknown liquid was 1. 124 During the trials noticed that after each trial the mass of the liquid would decrease causing the density to decrease as well. The possible errors that may have occurred during the experiment were that e might have not cleaned the measuring devices fully after each trial, We may have also not let everything come out tot the piper, there for being inaccurate.
Questions and Answers l. What are specific gravity and density and how are they related? The specific gravity is the ratio of the density to some standard density. Density is an object that is defined by its mass per unit volume. They are both related to a material. These are two different, but related things. Density is the mass per volume. Specific gravity is the ratio of the density of something to the density of water. Since water at this temperature and pressure has a density of approximately I OHO keg/AMA, density and specific gravity for a specific substance may be the same number, depending on what units are used for the density.
Also specific gravity doesn’t have any units. 2. The density Of air is I . 29 g/L. What volume Will 4. 00 g Of air occupy? The volume of 4. 00 g of air would be 3. 10 L. 3. What is the mass of piece of iron, which has a volume of 120. 0 ml and a density of 7. 20 g/ml? The mass is equal to 864. 0 g by multiplying the volume (120. 0 ml) by the density (7. 20 g/ml). 4. A 50,00 ml pipette delivers 39,67 Goff kerosene (d=O. 2 g/ml), What is the percent error in the piper? 3. 24% is the percent error in the pipette.
Conclusion Briefly relate your experience with the experiment to the purpose. (1-2 sentences) During this experiment I was able to familiarize myself with instruments/flasks and other measuring items that had never used before. This experiment also allowed me to become confident with using the formulas to find the density, mass, volume, percentage error, and absolute error. Which in the end was exactly was the purpose was of this lab experiment. They wanted us to acquaint ourselves With laboratory procedures, methods, and techniques.