Chemistry Notebook

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Portage Learning *

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103

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Chemistry

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Dec 6, 2023

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Chemistry Lab Report N.1 Name: Maria Estefania Larson Date: October 2023 Experiment #: 1 Title: Equipment and Safety & Mass and Volume Measurements Purpose: The purpose of this experiment is to familiarize with the lab equipment and how to use it, providing a safe environment when working in a chemistry lab. Another purpose of this experiment is to perform mass and volume measurement to determine weight and length of objects or substances when working in a chemistry lab. Procedure: Equipment & Safety 1) Observe and determine the function, purpose and proper use of the equipment and materials present in the lab. 2) Write a list with a brief description of the materials present in this experiment. Measurement 3) To perform analytical balance: record the mass in grams of 3 different objects by placing them in different 5 balances. 4) Make a chart to compare weights. To perform volume measurement: record the volume of water at 21.4 C temperature. 5) Place the beaker on the balance 6) Tear to zero 7) Record and compare the mass of 10 ml of water from a buret, 10 ml of water from a 10 ml pipet, 10 ml of water from a 100 ml graduated cylinder, 10 ml of water from a 25 ml graduated cylinder, 10 ml of water from a 10 ml graduated cylinder.

Data/Results/Calculations: Table No. 1. Mass Calculations Weight on balance #1 Weight on balance #2 Weight on balance #3 Weight on balance #4 (triple beam balance) Weight on balance #5 (single pan) Phone 92.9738 g 92.9738 g 92.9748 g N/A 92.97 g 92.98 g Graduated Cylinder 47.6204 g 47.6214 g 47.6129 g N/A 47.62 g 92.98 g Metal Cylinder 21.5953 g 21.5952 g 21.5957 g 21.35 g N/A Table No. 2. Volume calculation 10.1 ml of water from a buret 10 ml of water from a 10 ml pipet, 10 ml of water from a 100 ml graduated cylinder, 10 ml of water from a 25 ml graduated cylinder, 10 ml of water from a 10 ml graduated cylinder. Mass of 10 ml of water 10.0722 g 9.9803 g 10.3802 g 9.7781 g 10.0633 g Measured volume = 10.0722 g / 0.9979073 = 10. 09 ml = 9.9803g / 0.99791 = 10.00 ml = 10.3802 g / 0.9979073 = 10.40 ml = 9.77781 g / 0.9979073 = 9.80 ml = 10.0633 g/ 0.9979073 = 10.08 ml Percentage of error in volume 0.10% 0% 4 % 2.00% 0.80% Density of water at 21.4 C = 0.9979073 g/ml Formula to use: D= M/V

Conclusions: There is a slightly difference in the result of masses 0.0001 of a gram When calculating volume from 5 different cylinders and pipets, there is a % of error in 4 out of 5. The 0 % of error came from the 10 ml pipet showing that this is the device with the highest accuracy. The buret was the second most accurate with a 0.01% error. The 25 ml graduated cylinder is in 3rd place of accuracy with a 0.80% error. While the 25 ml and 100 ml graduated cylinders have a 2.00% and 4.00% error respectively. In conclusion, the bigger a graduated cylinder is, the higher percentage errors it will give. Notes: Materials present in the lab experiment. - Beaker glass acid bases organic everything. There are different sizes between 1000 mL to 250 ml. - Flask. With a narrow opening on the top. Suitable for pouring liquids. There are various types: Erlenmeyer Flask, Filtering flask with a side, Volumetric flask measures an specific volume of liquid. - Funnels. Plastic, Gravity funnel, Suction Funnel. - Bunsen Burner. Gas striker - Fisher Burner. wider . - Sponge clean for water spills - Ruler for measurement in cms and inches - Scoopula to transfer solids - Spatula to pick small amounts of solids. - Tongs for picking hot beakers - Test tubes picker - Wire gauze bottom of the beaker while heating - Ring stand to suspend items - Buret clamp - Condenser tube - Clamp graduated cylinder to measure liquids - Watch glass used as weighing dishes - Buret long tube calibrated for measuring small amounts of liquids. - Pipet accurate for measuring small amounts of liquids. - Test tube different sizes.

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- Digital thermometer Personal safety equipment - Lab coat to protect clothes from spills of chemicals, sprays, poisons, gasses, etc. - Safety glasses to protect eyes. Safety devices: - Hood or fume cupboard. - Portable Shield - Gas shutoff valve - Fire extinguisher - Chemical spill treatment kit - Safety Shower - First Aid kit - Fire Blanket