Last Updated 07 Sep 2020

Law of Conservation of Mass Inquiry

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Table of contents

Lab Background

In the 19th century, Antoine Lavoisier discovered the Law of Conservation of Mass, the Law of Conservation of Mass states that mass is neither created nor destroyed during ordinary chemical reactions or physical changes. A Closed System can not exchange any of heat, work, or matter with the surrounding. An Open System can exchange all of heat, work, or matter. It allows interactions between its internal elements and the environment.

Purpose

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The purpose of this lab was to designed and complete a laboratory experiment that proves the law of conservation of mass. Procedure First of all, a flask was taken out and filled in with 15ml of water. The mass of the flask & water was determined and recorded. Then, an Alka Seltzer tablet was filled in the water. After a while, placed the flask & water & Alka Seltzer tablet on to the balance pan, the mass of the whole system was determined. This procedure was for the open system. For the close system, a flask was taken out and filled in with 15ml of water.

The mass of the flask & water was determined and recorded. Then, an Alka Seltzer tablet was placed in a balloon and put the balloon on the top of the flask, the Alka Seltzer tablet fell into the water. After the reaction was done, measured the mass of it, recorded it into the data table.

Data Table

Data of Law of Conservation of Mass
Mass
Open system before 126. 3g
Open system after 126. 09g
Closed system before 143. 65g
Closed system after 145. 21g

Conclusion and Analysis

The mass of the open system before was 126. 53g and the mass of the open system after were 126. 09g. The mass of the closed system before was 143. 65g after was 145. 21g.

Both sets of data were close enough to justify the law of conservation of mass which is the mass was about the same before and after a reaction. According to the reaction, which was H2O + NaHCO3 = CO2 + H2O + NaOH, showed that there was some gas that was CO2 was produced. According to the law of the open and closed system, the CO2 was escaped from the open system, on the other hand, it was kept in the closed system. Because of that, the open system was missing some of the mass of gas, it made the first procedure differ from the second procedure.

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