Silica Lab Write-Up
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Problem: We wanted to know how much SiO2 was in the water under the bridge, next to Cenex. Hypothesis: We thought that there was less than 10 Parts-Per-Million was in the water. Experiment: Materials: Gloves
Problem: 1.Fill test tube to line with sample water.
2.Add 7 drops of *Silica Reagent #1 (4571). Cap and mix by inverting 4 times. 3.Add 6 drops of *Silica Reagent #2 (4467). Cap and mix. Wait 5 minutes. 4.Add 6 drops of *Silica Reagent #3 (4468). Cap and mix. Wait 2 minutes.
5.Use Pipet (0352) to add 2 drops of *Reducing Reagent (6405). Cap and mix. A BLUE color develops in 10 seconds if Silica is present. 6.Insert Test Tube in to Silica Comparator (4465). Match sample color to a color standard. Record as ppm Silica. NOTE: If test color is darker than the 10.0 ppm standard, repeat test on diluted sample. Use Pipet (0353) to add 0.5 mL mark with diluted water. Follow Steps 2 through 6 above. Multiply results by 10. Record as ppm Silica. Conclusion: We got a darker blue than 10 ppm Silica in Chimacum Creek, under the bridge next to Cenex which means that there is really high Silica because of tannin we can't be sure that there is that much Silica in the water. Tannin is a chemical that gets into the water by floating wood debris. The tannin interferes with the chemicals to make the chemicals think that they are Silica. We over all proved our hypothesis wrong beacause there wasn't less than 10 ppm in Chimacum Creek, under the bridge, next to Cenex. We can't exactly say that there is a darker blue than 10 ppm in the creek because there is tannin in the water. If we could redo our experiment we would NOT dump out the diluted water or spill things EXAMPLE:
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