This figure demonstrates the conservation of mass law in a closed system. A solution of copper sulfate is taken in a beaker and a solution of sodium hydroxide is taken in a test tube. The test tube is suspended inside the beaker with a string attached to it. Consider when the whole system is weighted, then it comes out to be 50 gm. After releasing the string, the solution of sodium hydroxide is mixed with copper sulfate solution. Even after the solutions are mixed thoroughly with each other and the weight of the combined solution will remain the same, i.e., 50 gm. This showed that in a closed system, the mass of substance will always remain the same, no matter what changes in the substance.
Conservation of Mass in Open System
Consider some marble chips (limestone) and some amount of hydrochloric acid (HCl) and mix both in a beaker and the weight of the solution that comes out is 85 gm. Then, the limestone reacts with hydrochloric acid (HCl) to produce carbon dioxide gas. The carbon dioxide gas escapes through the plug made of cotton wool inserted at the mouth of the beaker. Other products will be left inside the beaker after the reaction, and the reading showed by the electric balance is 80 gm. If the amount of carbon dioxide gas that escaped through the plug could be weighed, then the total weight of the solution and gas escaped will come out to be 85 gm. This implies that although some mass is lost in the form of gas escaped from the system, the law of conservation of mass remains true in an open system if the mass of all the entities is sum up together.
Law of Conservation of Mass
According to the law of conservation of mass, the mass can neither be created nor destroyed but can be converted from one form to another in an isolated system. During chemical reactions, the mass of reactant’s is same as the mass of the final products. Some examples of the conservation of mass are; the combined mass of sugar and water before dissolving is same as the mass of the system when sugar is dissolved into the water. The mass of ice before melting is equal to the mass after it melts to form water. Moreover, the same is true with water changes into water vapor, as the matter changes the form, but the mass always remains conserved. The conservation of mass can be mathematically represented in the differential form:
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