Chemistry Lab 1 Conclusion

Chemistry Lab 1 Conclusion - b. I knew the buret would be...

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Drew Rasmussen Katri Truhler Chemistry 111L September 9, 2010 Introduction to Chemical Measurements 1. The glass ware with the largest standard deviation was the 100mL Graduated Cylinder. The glass ware with the smallest standard deviation was the 10mL Graduated Cylinder. The glass ware with the largest relative percent error was the 10mL graduated cylinder, and the glass ware with the smallest relative percent error was the Buret. a. My results made sense because I knew a 100mL graduated cylinder would be very hard to have repeatable measurements of water with, and a 10mL graduated cylinder should have the least because its volume matches the volume of the water much closer than the other measurement methods.
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Unformatted text preview: b. I knew the buret would be very accurate / precise when measuring water because it lets the water out at a constant rate, and this rate can be increased and or decreased. 2. The glass ware whose standard deviation was not in range of the accepted value included the 10mL graduated cylinder, and the volumetric pipet. I believe the error in the graduated cylinder came from misreading the meniscus, and coming up with an incorrect volume measurement. The volumetric pipet tended to lose or gain small amounts of water as you removed the pipet tip from the water. This could account for the numbers being outside of the standard deviation....
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