1. Kirah Howell, Margaret Walker & Melanie Fannon

2.  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

3.  Water should have a pH between 6.5 and 8.5  Hard water causes problems to water  Too much sulfate can affect water

4.  Calibrate pH meter with 4,7 & 10 buffers  Pour 25 mL of water sample into beaker  Test each sample

5.  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

7.  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

9.  Low Molarity of the EDTA  Indicator  Multiple times to find the end point of each sample.

10.  pH Creek7.72 Little Run7.82 Business Building7.70 Campbell Hall8.12 Country Club7.78

11.  [Ca 2+ ] and hardness LocationVol (mL) EDTA Business Building38.30 Country Club34.80 Campbell Hall34.90 Little Run35.20 Creek35.03

12.  [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

13.  SO 4 2- LocationVol (mL) EDTA Business Buidling86.67* Country Club41.10 Campbell Hall39.53 Little Run40.73 Creek41.10

14.  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

15.  The Experiment was successful  The differences of each site  Challenges that were faced  Errors that we encountered

17.  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)