Your company is developing cheaper methods for determining the amount of arsenic in water supplies. A new chemical, Red-K9, is a red material which bonds to arsenite according to the following reaction: AsO2- + Red-K9 ---> AsO2-Red-K9-, giving a colorless product.
In order to test the method, you are asked to determine the amount of As in the water sample.
(Please use three significant figures in all your results.)