Your company has recently developed a potentially cheaper method for determining the amount of arsenic in water supplies. This new chemical, X, is a colorless substance that binds to arsenite according to the following reaction: AsO2- + 4HX ---> AsX4-
Since X is colorless, it is hard to tell exactly how much of the arsenite has been treated. Using a green chemical Y, however, you can detect the amounts of X in a given solution according to this reaction; 3Y(green) + HX ---> HXY3(orange).