Solving for a reactant in solution 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 200. mL sample of groundwater known to be contaminated with iron(II) chloride, which would react with silver nitrate solution like this: FeCl₂(aq) + 2 AgNO3(aq) → 2 AgCl(s) + - Fe(NO3), (aq) The chemist adds 29.0 mM silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected 3.2 mg of silver chloride. Calculate the concentration of iron (II) chloride contaminant in the original groundwater sample. Round your answer to 2 significant digits. 4 e mg L X

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Chapter9: Chemical Quantities
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Problem 55QAP: A common method for determining how much chloride ion is present in a sample is to precipitate the...
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**Solving for a Reactant in Solution**

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 200. mL sample of groundwater known to be contaminated with iron(II) chloride, which would react with silver nitrate solution like this:

\[ \text{FeCl}_2(aq) + 2 \text{AgNO}_3(aq) \rightarrow 2 \text{AgCl}(s) + \text{Fe(NO}_3\text{)}_2(aq) \]

The chemist adds 29.0 mM silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected 3.2 mg of silver chloride.

Calculate the concentration of iron(II) chloride contaminant in the original groundwater sample. Round your answer to 2 significant digits.

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**Input Box:**

\[ \boxed{\dfrac{\text{mg}}{\text{L}}} \]

Options for entering data include a checkbox for multiplying by \(10^x\), and buttons for executing or resetting the input.
Transcribed Image Text:**Solving for a Reactant in Solution** 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 200. mL sample of groundwater known to be contaminated with iron(II) chloride, which would react with silver nitrate solution like this: \[ \text{FeCl}_2(aq) + 2 \text{AgNO}_3(aq) \rightarrow 2 \text{AgCl}(s) + \text{Fe(NO}_3\text{)}_2(aq) \] The chemist adds 29.0 mM silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected 3.2 mg of silver chloride. Calculate the concentration of iron(II) chloride contaminant in the original groundwater sample. Round your answer to 2 significant digits. --- **Input Box:** \[ \boxed{\dfrac{\text{mg}}{\text{L}}} \] Options for entering data include a checkbox for multiplying by \(10^x\), and buttons for executing or resetting the input.
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