# Simple Balance Lab

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The first balance was used in Mesopotamia at about 4000 B.C. The balance used was constructed using a pivot point located at the center of a beam with measuring points equally close to the end. The purpose of this experiment is to show that a simple balance could produce similar result to the of a high-tech electronic balance. Three tests were done using the simple balance: one being unknown densities, mass of an object, mass lost during a reaction. Using chi-squared and t-test the data was analyzed. There was not a significant difference between the two devices used. Introduction The need to have the knowledge of how much of an item is present is not a new invention. Over six thousand years ago humans developed a way…show more content…
Water was the heaviest with a density of 1.0 g/mL. Pipette B was balance at 12.5 cm away from the fulcrum which when calculated it had a density of 0.89 g/mL as seen in Table 1. Pipette C was balanced at 11 cm away from the fulcrum which when calculated had a density of 0.79 g/mL as seen in Table 1. The density of the unknown pipettes was 0.80 g/mL. The unknown pipette B (X21=0.10, p>0.05) and pipette C (X21=0.001, p>0.05) had no significant difference from the electronic balance when calculating the density of each of the…show more content…
The amount of water added to the initial bucket was 1mL, which equal 1g for H2O with a density of 1 g/mL. The amount of sodium bicarbonate added to the opposite bucket should have equaled 1 gram. Once the hydrochloric acid was added to the reaction and allow to reach completion the amount of carbon dioxide was measured. The amount of carbon dioxide released in the reaction did not have a significant difference trial 1(X21=0.18, p>0.05), trial 2(X21=0.20, p>0.05), and trial 3 (X21=0.18, p>0.05). In Table 4, the actual amount of sodium bicarbonate used was calculated using the amount of carbon