Exp+0+Lab

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School

New Jersey City University *

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Course

1106

Subject

Chemistry

Date

Feb 20, 2024

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pdf

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Uploaded by MagistrateIceDeer27

LABORATORY REPORT Basic Laboratory Techniques Name: Menatalla Nosear Date: September 14,2023 Lab Partner’s Name: Mohamed Mohamed Score: _________________ I. Introduction The purpose of this lab is to accurately measure and analyze distance, volume, and mass using a meter stick, graduate cylinder, and balance. In the lab we used accurate instruments for measurements. It’s important to specify the right number of significant figures and use the correct units when reporting results. In the first experiment’s part 1 we learned how to read a meterstick and convert between different units, such as inches, centimeters, millimeters, and meters. In the second part of the DAT water volume using graduated cylinder, paying close attention to the lower part of the liquid, lastly, we determined mass accurately using weighing scale. II. Results Analysis A. Data CHECK DATA SHEET B. Discussion And finally, to convert millimeters to meters, you would have to divide by 100, which came out to be 0.27940 meters long. The length came out to be 27.94 cm long. For the width, 8.5in was the result for the measured number. When converted to centimeters, it came out to be 21.59 cm, and to millimeters, 215.9 mm and finally to meters, it was 0.2159 m. For the width in centimeters was 21.59 cm The area of the paper was also found by using the formula length times width and the measured number, 27.94 cm x 21.59cm = 93.5 cm2. In part II of the experiment, a gradated cylinder was used to measure the volume of the liquid in millimeters. When reading the graduated cylinder, on the side of it, there are graduation scribed that measure to 0.5 mL which is the smallest measurement you can read on the cylinder with 3 significant figures. The measured volume was 86 mL. For the liquid that was contained in the test tube and poured into the graduated cylinder, the results were 61 mL. In part III of the experiment, a graduated pipet and balance was used to measure the mass. Since graduated pipets are calibrated to deliver a precise volume at a specific temperature, the calibration of a graduated pipet was performed to verify its accuracy and precision. An Erlenmeyer flask was put on a scale to begin measuring the mass. For trial 1, the reported data was 40.452, trial2: 41.110, trial3: 41.033 A thermometer was placed in room temperature water to calibrate the pipet. The temperature was 22 degrees Celsius, and the density was 0.997770 g/mL. The pipet was then placed in water, grabbing the proper quantity of water, which in this case was 10 mL, and using the same procedure as in part II of the experiment. The flask containing 10 mL of liquid was placed on the weighing equipment. These steps would be carried out twice. The reported data for the first trial was 15.374g. The second trial had a result of 14.695g, and the third trial had a

result of 14.383g. To get the net mass, the flask measurement and the flask with the 10mL were subtracted from each other. The first experiment weighed 55.826g, the second 55.805g, and the third 55.416g. The volume was calculated by dividing the mass by the density (0.997770 g/mL). If you divide 15.374g by 0.997770g/mL, you get 15.408 mL; divide 14.695 g by 0.997770 g/mL it’s going to equal 14.727 mL; and 14.383 g divided by 0.997770 g/mL, equal to 14.415 mL. The volume's mean was 14.85 mL, to get this number add all three volumes and divide the sum by three. To obtain the deviation, subtract the volume from the mean (14.85 – 15.408 = 0.558, 14.85 – 14.727 = 0.123, 14.85 – 14.415= 0.435), and the average deviation is the same as the mean volume, which is 1.116 mL. The graduated cylinder had an accuracy and precision of 14.85 mL III. Conclusion In the lab, we learned important procedures like calibrating a graduated pipet, measuring liquid volume with a graduated cylinder, and using a meterstick for length measurements. When working with measurements and data analysis, it's crucial to report results with the right number of significant figures. By comparing our results to established values and providing similar outcomes, we confirmed accuracy and precision. ATTACHMENT 1 DATA SHEET Part I Measuring Length and Unit Conversion Readability of meter stick (What is the smallest division (in inches) you can read on the meter stick? How many decimal places will you use to present your measured length data): 1/16 = 0.063; 3 decimal places Length of paper 11 in 27.94 cm 279.4 mm 27940 m Width of paper 8.5 in 21.59 cm 215.9 mm 0.085 m Using an equation (including units), show that measurements are equivalent. Show all conversion calculations. Area of paper 93.5 cm 2 Part II Measuring Volume of a Liquid Using the Proper Technique

Readability of 100 mL Graduated Cylinder (What is the smallest unit division (in millimeter) you can read? How many decimal places will you use to present your measured volume data?): 0.5 mL, 1 decimal place Volume of water in graduated cylinder 86 mL Volume of water contained in largest test tube 61 mL (depends upon test tube) Part III Using the Balance to Calibrate a 10 mL Graduated Pipet Room temperature of water used in pipet 22 °C Density of water at room temperature 0.997770 g/mL Readability of Weighing Balance (How many decimal places you can read on the weighing balance? How many decimal places will you use to present your measured mass data?): 0.0000 (4 places) Trial 1 Trial 2 Trial 3 Mass of Erlenmeyer + 10 mL H 2 O (gross mass) 55.826 55.805 55.416 g Mass of Erlenmeyer flask (tare mass) 40.452 41.110 41.033 g Mass of 10 mL of H 2 O (net mass). ) 15.374 14.695 14.383 g Volume delivered by 10 mL Pipet (show calculations) Mean volume delivered by 10 mL pipet (show calculations) 14.85 mL 15.408+ 14.727 +14.415/3= 14.85 mL Trial 1 Trial 2 Trial 3 Individual deviations from the mean 0.558 0.123 0.435 Average deviation from the mean (show calculations) 1.116mL 0.558+ 0.123+0.435/3

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