# Procedure and materials part i 1 weigh a weighing

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Procedure and Materials: Part I 1. Weigh a weighing paper on an analytical balance making sure to zero the balance first. 2. Add a coin without touching it, use tweezers or Kim wipe, onto the weighing paper and record its mass. 3. Calculate the mass of the coin and the standard deviation. Part II 1. Take a 250 mL clean beaker and obtain distilled water. 2. Take the temperature of the water and its density.
3. Obtain the tare weight of a 150 mL beaker using the analytical balance. 4. Take a 25.00 mL pipet and first clean it with a few drops of water. 5. Transfer 25.00 mL of water into the 150 mL beaker and weigh on the analytical balance. 6. Calculate the mass of the water, the volume of the water and the tolerance of the 25 mL pipet. 7. Repeat steps 3-7 two more times but leave the water inside the beaker, just use the previous calculation for the tare weight and add 25.00 mL of water. Part III 1. Obtain a clean and dry 100 mL volumetric flask and weigh it on the analytical balance. 2. Mount a buret and fill with distilled water. Make sure the buret tip is filled and using the stopcock, the buret is to the 0 mark. 3. Carefully transfer 10.00 mL of water into the 100 mL volumetric flask, letting the tip of the buret touch the wall of the flask. 4. Weigh the flask with the 10 mL of water. 5. Calculate the mass and the volume of the water. Also find the tolerance of the buret. 6. Repeat steps 3-5 two more times without emptying the flask, just using the mass of the flask and the water as your empty flask for the next trial. Qualitative Observations: A light weighing paper copper penny Transparent 50mL buret, 25 mL pipet, 150 ml volumetric flask, 250mL beaker glassware Quantitative Observation: Mass of coin: Mass of coin with paper-mass of weighing paper Average mass of coin: Mass of coin trial 1+Mass of coin trial 2+Mass of coin trail 3 STD of coin:
Mass of 25.00 mL of water in a 150 mL beaker: Tare weight of beaker and water - tare weight of