which reacted with the water by ion exchange, which removed the Ca and Mg ions. This concluded the lab and with all this information, we compared and made conclusions about our water samples. This experimental procedure was completed in order to find the hardness of samples of water. My group has chosen three different types of tap water from three different areas in order to show the comparison of the hardness of tap water. The samples were taken from East Halls (Hastings) in State College, a house in Pittsburgh, PA (2418 Rolling Farm’s Road), and from a hotel room in Panama City, FL. We assumed for our hypothesis that the water from East Halls would have been the hardest due to the size and the length of travel of the water through the large pipes, which are underground. Through testing the water samples by AA and EDTA testing, we concluded that the water from Florida was the hardest. Next came the sample from East Halls, State College, and then the sample from Pittsburgh, PA. The following table is a summary of both tests, the AA and EDTA titration testing.Table 2Source of WaterConcentration of Ca from AA TestAbsorbance Value for Ca from AA Test (at 422.7 nm)Concentration of Mg from AA TestAbsorbance Value for Mg from AA Test (at 202.5 nm)Concentration of Ca from EDTA TitrationTap in Dorm Room in East Halls25.55 mg/L0.42918.75 mg/L0.3771140 ppmTap from House in Pittsburgh, PA20.29 mg/L0.34246.02 mg/L0.154120 ppmTap from Hotel Room in Panama City, FL29.1 mg/L0.488829.04 mg/L0.5773320 ppmWe have proven that our hypothesis was wrong. This hypothesis is wrong because of the error of research. We thought since the system in the dorms would be the hardest because of the large pipes underground which would have a greater change of letting ions enter the water. However, the water from the hotel room was the hardest because for one reason it was taken from a completely different state in the United States and therefore shows that differ...
