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Project 3: Analysis of Florida Water

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Ayani Burlas

on 29 October 2014

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Transcript of Project 3: Analysis of Florida Water

Water contains a certain amount of Calcium and Magnesium ions
These can react with soap and cause soap scum
2 NaC15H31COO + Ca2+ --> Ca(C15H31COO)2 + 2 Na+
Problems with Water Hardness
Calcium carbonate is an insoluble white precipitate.
The presence of these ions can damage water heaters and clog pipes.
Water Hardness
Water hardness is reported as miligrams of CaCO3 per Liter of water
dissolved limestone is the major cause
Black T indicator has a red color when with Ca2+ or Mg2+. It is blue when these ions are removed.
EDTA is a weak acid. A pH 10 buffer is used to keep the acid groups deprotonated.
What is in our water?
Week 1
In order to perform any experimental procedures, make sure to be in proper dress code. Following the checking of dress code, gather all materials needed for the experiment to be conducted. Begin by making the EDTA solution with a 0.01 Mol concentration. Use proper math steps to derive the amount of water and EDTA that will be mixed together. Add this solution into the burette borrowed from the stock room. The next solution will be created from using Calcium Chloride, ammonium buffer, deionized water, and several drops of indicator. That solution will be placed in a 250mL volumetric flask. Three trials of titrations will be conducted with results recorded. Once the experiment has been ran through with sufficient data, clean-up the lab area and plan for week two.
Week 2
In order to perform any experimental procedures, make sure to be in proper dress code. Following the checking of dress code, gather all materials needed for the experiment to be conducted. There should be three water samples that were brought from outside the lab to be tested for this experiment. Multiple tests will be performed on each of the three water samples. Conductivity test, most important detail is to be sure that the water fills the probe up to the second indicated marker. Also, a pH test, permanent water hardness, and total water hardness were performed. Three trials for each water sample in each test will be conducted. Once all trials have been completed and all data recorded, clean-up the lab area and discuss plans for the group presentation.
Project 3: Analysis of Florida Water
by Team TATLO
USF Water Fountain
Total Hardness
Pond Water
USF Sink Water
Permanant Hardness
Temporary Hardness
5.4 mg/L 2.3 mg/L 3.1 mg/L
0.8 mg/L 0.3 mg/L 0.5 mg/L
3.5 mg/L 2.1 mg/L 1.4 mg/L
This shows the results for the Water Hardness. The Total Hardness is the overall of CaCO3 the water contains. The Permanent Hardness is the amount of CaCO3 that cannot be remove from the water. Lastly, the Temporary Hardness is the amount of CaCO3 that can be remove from the water simply by just boiling the water.
USF Water Fountain
Pond Water
USF Sink Water
383 µS/cm 6.65
1424 µS/cm 5.52
1392 µS/cm 6.52
This shows the results for the Conductivity. The higher the conductivity easier electricity can pass through the water.

This table shows the results for the PH. The ideal PH for water is 7.
After obtaining results,
The next step was to compare ours to that of what is considered ideal characteristics of water. Multiple sources state that for the most safe, beneficial drinking water for humans, the pH should be between 6.5 and 8.5, conductivity should be less than 800 µS/cm, and total water hardness should never exceed 300 mg/L of CaCO3 with the softest water ranging between 0 to 75 mg/L CaCO3.
Water Hardness
pH and Conductivity
Based on their conductivity, the fountain drinking water is safe to ingest. However ingesting pond water or sink water is not suggested. Based on their pH, the sink water and fountain water from USF have a safe pH for ingestion. But, the pond water sample is slightly more acidic than the other two.
Based solely on water hardness, all three water samples are safe to ingest. And are comparably soft according to the water hardness scale used. All were under 75 mg/L.
illustration of titration
indicator used in the investigation
drinking fountain similar to the one a sample was obtained from
pH meter alike the one used in the experiment
Problems, Adjustments, etc.

some issues that arise when observing the percent error of our results include simple factors such as not cleaning the glasses thoroughly enough prior to use, which would ultimately cause extra constituents to accumulate and may alter certain results. Along with similar human error like possibly titrating our solution too much, causing inaccurate and imprecise results. Pertaining to pH and conductivity, the pH meter should have been rinsed off before each application of the trail tests as well as the conductivity meter.
form of EDTA
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