What would be the conclusion for this experiment 60 CHE115 The puzzle: Most basi

Question

What would be the conclusion for this experiment 60 CHE115 The puzzle: Most basically, the law of mass conservation states that matter can neither be created nor destroyed. When Antoine Lavoisier proposed this idea in 1783 many chemists still believed (as they had for about 100 years) that heat could be used to create new mass, a theory wn as phlogiston theory. Lavoisier challenged the phlogiston theory. By performing basic chemical reactions and collecting quantitative data he was able to disprove a theory that chemists had been relying on for 100 years and completely revolutionize chemistry kno In has been almost 250 years since Lavoisier proposed his theory of mass conservati Your task for today is to challenge it. Rules of the game: 1. You must work on your puzzle in groups of 2 students 2. You may choose to study either of the precipitation reactions we have explored this semester 3CaCl2 (ag) +2NasPO4 (a) Cas(PO4)2 ()+ 6NaCl (a) Na2CO3 (aq) + CaCl2 (aq) CaCO3 (s) + 2NaCl (aq) 3. You may not use more than 5 grams of each reactant during any experiment. 4. You may not use more than 50 mL of solvent during any experiment. 5. You must share your results with the rest of the class. ues to help you solve the puzzle: Remember that while calcium phosphate and calcium carbonate are insoluble salt sodium chloride is a soluble salt. 1. 2. According to the law of definite proportions Na2CO3 reacts with CaCl2 in a fixed rat of 1 g to 1.04 g and NasPO4 reacts with CaCl2in a fixed mass ratio of 1 g to 1.02 g . Consider the following questions

Explanation / Answer

Na2CO3 (aq) + CaCl2 (aq) --> CaCO3 (s) + 2 NaCl (aq)

According to mass conservation theory,

Mass of reactants = Mass of products + Mass of unconverted reactants

Mass of Na2CO3 + Mass of CaCl2 = Mass of CaCO3 + Mass of NaCl + Mass of Na2CO3 (unconverted) + Mass of CaCl2 (unconverted)

In this experiment, mass of reactants is to be measured and compared with mass of products obtained and mass of unconverted reactants. The objective of this experiment is to verify mass conservation theory.

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