Question

One way the U.S. Environmental Protection Agency (EPA) tests tor chloride contaminants in water is by titrating a sample of silver nitrate solution Any chloride anions in solution will combine with the silver cations to produce bright white silver chloride precipitate Suppose an EPA chemist tests a 250. mL sample of groundwater known to be contaminated with iron (II) chloride, which would react with silver nitrate solution like this: The chemist adds 88.0 mM silver nitrate solution to the sample until silver chloride stops forming. She then washes, dries, and weighs the precipitate. She finds she has collected s.6 mg of silver chloride Calculate the concentration of iron(II) chloride contaminant in the original groundwater sample. Be sure your answer has the correct number of significant digits mg A chemist prepares a solution of sodium carbonate (Na,co) by measuring out 82.5 umol of sodium carbonate into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mo/L of the chemist's sodium carbonate solution. Be sure your answer has the correct number of significant digits mol

Answer 1