Creative Essay

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EXPERIMENT OF THE LAW OF CONSERVATION OF MASS | CHEMISTRY LABORATORY REPORT Aim: To observe the law of conservation of mass using the reaction of sodium carbonate, calcium chloride and sulfuric acid and to show the importance of careful measurements when using instruments, namely, an electronic balance. Apparatus: Laboratory Balance 3 Rubber Stoppers (to fit test tubes and flask) 125 mL Conical Flask 3 Labels Safety Goggles Laboratory Coat 10 mL Graduated Cylinder 2 Test tubes (13 × 100 mm) 10.0 mL Sodium Carbonate (1M) 3.0 mL Calcium Chloride (1M) 3.0 mL Sulfuric Acid (1M) Method: Sodium carbonate was measured in a graduated cylinder, then transferred into a clean, dry Erlenmeyer flask and stoppered with a rubber stopper. Calcium chloride and sulfuric acid were placed in separate test tubes which were stoppered with rubber stoppers and labeled. The stoppered flask, both test tubes and an empty beaker to hold the test tubes were placed on an electronic balance and the mass was recorded and labeled ‘mass a’. The calcium chloride solution was added to the sodium carbonate solution and the flask was swirled. The flask and empty beaker were stoppered and replaced on the electronic balance with the sulfuric acid and the mass was recorded and labeled ‘mass b’. The sulfuric acid was added to the flask. The flask was swirled without the rubber stopper and left to cool. The three containers, rubber stoppers and contents were placed on the electronic balance and the mass was recorded and labeled ‘mass c’. Results: Mass a Mass b Mass c 194.60g 194.78g 194.69g Table 1.0 When sodium carbonate and calcium chloride were combined, the resulting substance was heterogeneous and became cloudy. After a few minutes, a grey powder settled on the bottom of the flask and the aqueous component became clear again. After sulfuric acid was added to the

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