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Published byRosa Walsh Modified over 9 years ago
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Kirah Howell, Margaret Walker & Melanie Fannon
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To determine the pH of five water samples To determine total hardness of these samples To test for how much sulfate is in the water samples
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Water should have a pH between 6.5 and 8.5 Hard water causes problems to water Too much sulfate can affect water
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Calibrate pH meter with 4,7 & 10 buffers Pour 25 mL of water sample into beaker Test each sample
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Make 2L of 0.005M EDTA solution Make 200 mL of CaCO 3 solution Standardize EDTA Combine 3 mL of CaCO 3, 5 mL of ammonia buffer, few drops of calmagite indicator & 25 mL of water sample into 250 mL Erlenmeyer flask Titrate with EDTA
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Make BaCl 2 solution Combine 150 mL of water sample, excess of BaCl 2 solution and a few drops of concentrated HCl in a 300 mL beaker and boil a hour then cool for 2 days Filter samples Titrate with EDTA solution
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Low Molarity of the EDTA Indicator Multiple times to find the end point of each sample.
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pH Creek7.72 Little Run7.82 Business Building7.70 Campbell Hall8.12 Country Club7.78
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[Ca 2+ ] and hardness LocationVol (mL) EDTA Business Building38.30 Country Club34.80 Campbell Hall34.90 Little Run35.20 Creek35.03
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[Ca 2+ ] and hardness Location[Ca 2+ ]Hardness (ppm) Business Building.00766306.99748 Country Club.00696252.2762133 Campbell Hall.00698279.74444 Little Run.00704282.14912 Creek.00674270.12572
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SO 4 2- LocationVol (mL) EDTA Business Buidling86.67* Country Club41.10 Campbell Hall39.53 Little Run40.73 Creek41.10
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SO 4 2- Location[SO 4 2- ]Ppm Business Building*7.153571016x10 -5 6.871791854 Country Club1.265206813x10 -4 12.15370316 Campbell Hall1.16367316x10 -4 11.17836074 Little Run1.203044439x10 -4 11.55656519 Creek1.16367316x10 -4 11.17836074
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The Experiment was successful The differences of each site Challenges that were faced Errors that we encountered
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Belle-Oudry, D. Quantitative Analysis of Sulfate in Water by Indirect EDTA Titration. Journal of Chemical Education. [Online] September 1, 2008. DOI: 10.1021/ed085p1269. http://pubs.acs.org/doi/abs/10.1021/ed085p1269 (accessed December 6, 2013) http://pubs.acs.org/doi/abs/10.1021/ed085p1269 EPA (Environmental Protection Agency)
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