Kirah Howell, Margaret Walker & Melanie Fannon

 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

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

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

 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

 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

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

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

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

 [Ca 2+ ] and hardness Location[Ca 2+ ]Hardness (ppm) Business Building Country Club Campbell Hall Little Run Creek

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

 SO 4 2- Location[SO 4 2- ]Ppm Business Building* x Country Club x Campbell Hall x Little Run x Creek x

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

 Belle-Oudry, D. Quantitative Analysis of Sulfate in Water by Indirect EDTA Titration. Journal of Chemical Education. [Online] September 1, DOI: /ed085p (accessed December 6, 2013)  EPA (Environmental Protection Agency)