Question 4 Chance
One way the U. S. Environmental Protection Agency (EPA) tests for 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 tin(II) chloride, which would react with silver nitrate solution
like this:
SnCl2(aq) + 2 AgNO3(aq) + 2 AgCl(s) + Sn(NO3),(aq)
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The chemist adds 83.0 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 5.3 mg of silver chloride.
Calculate the concentration of tin(II) chloride contaminant in the original groundwater sample. Round your answer to 2 significant digits.