Stoichiometry Lab Report

Cassity 1
Emma Cassity
Mr. Cabrera
Chemistry Period 5
15 February, 2015
Stoichiometry Lab Conclusion
Trial Experimental Mass of CaCO3 Percent Yield %
1 0.635 g 93.9 %
2 0.443 g 98.2 %
3 0.575 g 121.8 %

Level II
1a. If I did not wash all of the calcium carbonate out of the beaker and into the filter, my percent yield would be smaller because there would be less quantities in the filter.
1b. If I used tap water instead of DI water, the results would be very different since tap water holds many different things in it that could likely shake the results, whereas deionized water has gone through filters that would cleanse it of any other substances.
1c. If I did not allow the calcium carbonate and filter to dry out completely overnight, I would …show more content…
The system includes two buckets stacked on top of each other. First, water is poured into the top bucket, and then it goes through a mixture of iron and iron hydroxide, a composite iron matrix. Manganese serves as a catalyst in the transformation from toxic arsenite to arsenite ions. As the water goes through the second bucket, charcoal and sand layers extract the solid iron hydroxide, attached with arsenic and other chemicals that were not trapped in the top filter. After going through the second bucket, the water is stored in a container. The scientists manipulated the equation of arsenate ions bonding to the surface of iron …show more content…
Also, some people are not even aware of the arsenic and toxins in the water they are drinking. So scientists came up with a solution to clean the water- they found a way to pack the chemicals used in water treatment into a small pouch. These work in three steps called coagulation, flocculation, and disinfection. First, the powder is stirred into a bucket of water for five minutes while a chemical makes arsenic and other heavy metals precipitate out of the water into tiny grains. Then, a polymer puts the grains into big clumps that sit at the bottom of the bucket. While this happens, a chlorine-based disinfectant kills bacteria. Next, the water is poured through a clean cloth to filter out the clumps. After 20 minutes, the water is ready to

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