Objective
There were two reasons why we did our chemistry lab. One purpose was to prove the law of Conservation of Mass. The law states that during a chemical reaction no new atoms are created or destroyed, but they are merely rearranged. Another purpose is to prove that the coefficients used in balancing chemical equations are actually Mole ratios.
Theory
Our theory is that no new atoms will be created or destroyed during the chemical reaction. This is called the Law of Conservation of Mass.
Procedure
Before we start we need two clean and dry 250 mL beakers. Then label one beaker as Na2CO3 and the other as CaCl2. Then, we weigh the beakers and record the mass. Once this is done we add the compounds to their respected beakers. Then we add 30 mL of distilled water to dissolve the solids. Use a glass rod to aid in dissolving. When the solids are dissolved in water add the contents of the CaCl2 solution to the Na2CO3 beaker and mix with a glass rod. Heat the mixture until it is boiling then let it cool so that the precipitate can settle. Grab an iron ring and attach it to a stand. Then fold filter paper into a triangular cone and put it into a funnel and place it on the iron ring. Place the empty beaker under the filter paper and empty the heated beaker into the empty beaker. Try and keep precipitate in the beaker. When filtering is complete, place the filter paper in the Na2CO3 beaker. Leave both beakers to dry. Weigh the beakers when the contents are dried.1
Results
After we had gone through the procedure we recorded our observations and results. We observed that when adding water to both solids, it turned into a clear liquid. But when we mixed the two solutions it became pasty, cloudy and was filled with bubbles. As we mixed them the solution became cloudy and white. When we heated the solution, a clear solution settled on top of a white solution. We hypothesized that this must be the separation of CaCO3 and NaCl. The tables below contain the data that we have collected:
Object Measured|Mass(grams)|
Mass of beaker labelled Na2CO3|106.1|
Mass of beaker with Na2CO3|111.4|
Mass of Na2CO3 used|5.3| Object Measured|Mass(grams)|
Mass of beaker labelled CaCl2|107.1|
Mass of beaker with CaCl2|112.7|
Mass of CaCl2 used|5.6|
