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Lab 3 Discussion

Lab 3 Discussion - sulfate a brown ring could be seen in...

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Ying (Alan) Sun 10-30-07 Lab #3: Analysis of Water Discussion Part one of this water analysis lab was to observe containments in tap/ocean water through physical manipulation. In this case, we simply boiled down 75mL of tap water, observer any remaining residue and compared the masses of the beaker with water and beaker with just the residue. We ended up with 0.07g or 70mg of residue left over, which would seem like a very substantial amount with respect to the sample amount of only 75mL. Of course, we started the lab already knowing that the tap water was going to very polluted as told by the T.A. Part two of this lab involved identifying specific containments in tap water though chemical manipulation. The basic concept is to add chemicals to the numerous test samples and look for precipitate reactions to occur. The tap water had no traces of nitrate ions as there was no reaction between the added iron (II) sulfate and sulfuric acid. However, to get an idea of what the precipitate would've looked like, one sample of tap water had HNO3 added in and when combined with iron (II)
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Unformatted text preview: sulfate, a brown ring could be seen in the solution. Both calcium and magnesium ions were present as ammonium carbonate reacted with our sample to form calcium carbonate and magnesium carbonate, seen in the following balanced equations: Ca + CO3 -> CaCO3, Mg + CO3 -> MgCO3. Chloride was also in the water because when nitric acid and silver nitrate were added, silver chloride was formed as seen in this equation: Ag+ + Cl -> AgCl(s). Traces of sulfate was also seen because when barium nitrate was added, barium sulfate was formed which is seen in the following equation: Ba + SO42 -> BaSO4. Thankfully, no lead was present in the tap water or else when hydrochloric acid was added to one of our samples, lead (II) chloride would've been formed as exemplifed in the balanced equation: Pb + HCl -> PbCl2(s) + H. Overall, the more alarming containments were luckily not present in the tap water so it would be assumed that whatever is left over is of no major harm to people....
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