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Experiment #4
Weighing and Volumetric Techniques – Accuracy and Precision


Abstract
The purpose of this experiment is to become familiar with proper techniques for using the analytic balances, graduated cylinder, burette and pipette and determine which is more accurate and/or precise. In this experiment, the burette and pipette were more exact than the graduated cylinder and the analytic balance gave a very accurate and precise answer.

Results / Report

1) Weighing Copper
Copper sample #: 1
Balance #: 14
Temperature: 22.8EC

Weighing Attempt # Mass of Copper Sample (g)
1 3.1234
2 3.1233
3 3.1235
4 3.1232

Average Mass
= (3.1234g + 3.1233g + 3.1235g + 3.1232g) ÷ 4
=3.1234g

Standard Deviation

( - ) ( - )
3.1234 0 0
3.1233 -
3.1235
3.1232 -
Σ =

Or 0.0001

2) Burette Readings......

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Approximate Word Count: 340
Approximate Pages: 2 (250 words per double-spaced page)

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