chem 1A disc H2O analysis

chem 1A disc H2O analysis - around 25 mL left. The...

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Janice Oldham Chem Lab W-1pm Dennis 31 October 2007 Discussion: Analysis of Water Part one of this experiment included analyzing the presence of dissolved solids in ocean water. The water was placed in a beaker and boiled over a Bunsen burner until it was almost evaporated entirely. The weight of the beaker was calculated before the water was added and after it was boiled to find the mass of the remaining residue. The remaining solid was an off- white, hardened, and almost crystallized material. It was found to have a mass of 2.63 grams. This measurement may not be completely accurate as there could still be some water left over in the beaker after it was placed in the oven. The results tell us that there is a significant amount of dissolved solids present in ocean water. Part two of this experiment analyzed the existence of dissolved solids in tap water, by chemical analysis. We boiled 150 mL tap water over a hot plate and waited until there was
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Unformatted text preview: around 25 mL left. The remaining solution was placed in six different test tubes. The results were found by placing different chemicals in each test tube to see if a precipitate formed. We found there were no nitrate ions present in tap water because there was no precipitation reaction when iron sulfate or sulfuric acid was added. However we did find there were small amounts of calcium, magnesium, and chloride in the tap water. This can be seen by these balanced equations: Ca + CO3 > CaCO3, Mg + CO3 > MgCO3, calcium carbonate and magnesium carbonate formed when we added ammonium carbonate to the solution. Sulfate was also present in the tap water due to a precipitate forming when we added barium nitrate: Ba + SO4 > BaSO4. Lead was not present in the tap water and this was a good result, as it would not be healthy. The findings were very interesting as it is important to know what chemicals you are consuming when drinking water....
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This note was uploaded on 04/02/2008 for the course CHEM 1A taught by Professor Van koppen during the Fall '07 term at UCSB.

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