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)