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Lab report 2 - Assignment Example

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The wavelength dial was rotated and 510nm was selected. The cell was then filled with 25 ml of lake water. Content of one Ferro Ver Iron pillow reagent powder was then added and the readings taken
pressed. The wavelength dial was rotated and 530 nm was selected. The…
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Lab report: Determination of concentration of iron and chlorine in water samples PURPOSE The main aim of this experiment was to compare the concentration of iron and chlorine in different water samples.
METHODS
Iron, Total (0 TO 3.00mg/L). The program number for iron was entered and then 265 was
pressed. The wavelength dial was rotated and 510nm was selected. The cell was then filled with 25 ml of lake water. Content of one Ferro Ver Iron pillow reagent powder was then added and the readings taken
The same procedure was repeated for secondary treatment water.
Chlorine, total. The program number for chlorine was entered and then 265 was
pressed. The wavelength dial was rotated and 530 nm was selected. The cell was then filled with 25 ml of pool water. Content of one DPD total chlorine powder pillow powder was then added and the readings taken
The same procedure was repeated for tap water.
RESULTS
Iron 
1- lake water = 0.043 ppm
2- secondary treatment water = 0.043 ppm
Chlorine total 
1- total chlorine pool water = 1.06 ppm
2- total chlorine tap water = 0.05 ppm
Chlorine free 
1- pool water free blank = 1.91 ppm
2- tap water free blank = 0.05 ppm
DISCUSSION
The concentrations are
Iron 
1- lake water = 0.043 ppm= 0.000043 g/L = 0.000043/55.585 mol/L= 7.736 * 10-7 mol/L
2- secondary treatment water = 0.043 ppm=0.000043 g/L= 7.736 * 10-7 mol/L
The atomic weight of Fe is 55.585.
Chlorine total 
1- total chlorine pool water = 1.06 ppm= 2.99 * 10-5 mol/L
2- total chlorine tap water = 0.05 ppm = 1.41 mol/L
The atomic weight of Cl is 35.453.
Chlorine free 
1- pool water free blank = 1.91 ppm= 5.39 * 10-5 mol/L
2- tap water free blank = 0.05 ppm= 1.41*10-5 mol/L
In conclusion, the concentration of iron in the Lake Water and secondary treatment water is the same. While the total chlorine water in pool water is higher than tap water. This may be because of the hypochloric acid which is added on swimming pool to prevent bacterial infection. However, the blanks chlorine concentration was slightly high than the samples this may have been brought about by contamination. Read More
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