ent areas have different ways to contribute tap water to citizens. The sources of the water may differ depending on what location or what the surrounding geography is like around the city (ex: ocean, river, large city). The results for the TDS testing proved that our water sample did contain ions which left a residue. By comparing it to the distilled water drop, you could plainly see that the distilled water had much less residue or ions. Next, our outcomes were slightly different between the two different tests for our water samples. For example, in Table 2 the first test on the dorm water seems to be pretty accurate (140 ppm EDTA and 140.9 ppm AA); however, the other two samples vary between each test (120ppm EDTA and 75.4 ppm AA for the second sample and 320 ppm EDTA and 192.5 ppm AA for the third sample). This occurred because of human error. The EDTA testing is not as accurate as the AA testing because the EDTA testing is completely done by human calculation and observation. During the titration process, there could have been contamination in the wells and/or the pipets, which we were using in the experiment. Also, the observations could have been affected by this contamination. If the color changed too quickly/slowly, some of the chemical that causes the color change could have been present/absent in value compared to what was to be present/absent in value. However, even though the tests had different quantitative values, the overall picture is accurate. They still fit into the categories in Table 1, how hard/soft they are depending on how much ions are present in the water samples. Both the two tap water samples from State College and Pittsburgh, PA were soft and the hotel room water from Florida was hard as you can see in the following table:Table 3Source of WaterTotal hardness from AA test.Total hardness from EDTA test.Tap in a dorm (East Halls)140.9 ppm140 ppmTap from House in Pittsburgh, PA75.4 ppm120 ppmTap from hotel room i...
