2. In a method for the determination of free chlorine residual, which is reported as parts per million of Cl, the oxidiz

[answerhappygod]

2 In A Method For The Determination Of Free Chlorine Residual Which Is Reported As Parts Per Million Of Cl The Oxidiz 1 (60.9 KiB) Viewed 35 times

2. In a method for the determination of free chlorine residual, which is reported as parts per million of Cl, the oxidizing power of free chlorine converts the colorless amine N,N-diethyl-p- phenylenediamine to a colored dye that absorbs strongly over the wavelength range of 440-580 nm. Analysis of a set of calibration standards gave the following results ppm Cl, absorbance 0 0.50 0.270 1.00 0.543 1.50 0.813 2.00 1.084 a. Plot a calibration curve from these data using the MS Excel function. b. Use the method of least squares to find an equation relating absorbance and the concentration of copper. c. A sample from a public water supply is analyzed to determine the free chlorine residual, giving an absorbance of 0.113. What is the free chlorine residual for the sample in parts per million CI,? 0.000