1. Vernier Spectrophotometer
Effect of chlorine contact time on absorbance of water containing different concentrations of blue food coloring at a wavelength of 627.5nm
SeaVuria, 2012
April 6, 2012 (Mombasa, Kenya)

2. Concentration vs. Absorbance

4. Chlorine Contact Time vs. Absorbance
Contact Time (min.)
5 drops of SE200 Chlorine Solution
added to 50ml of 100% Blue Dye Solution
1 minute
2 minutes
3 minutes
Effect of Chlorine Contact Time on Absorbance at 627.5nm
Contact time (min.)
Concentration (x)
Absorbance *100 (y)
Absorbance
100
17.55
0.1755 1 94
16.39
0.1639 2 86
14.9
0.149 3 77
13.4
0.134
Concentration calculated using linear equation from Dye Concentration vs. Absorbance Control Experiment x = (y-0.449)/0.169