Solution: Douglasite is a mineral with the formula 2KCl • FeCl 2 • 2H2...

Question

Douglasite is a mineral with the formula 2KCl • FeCl ₂ • 2H₂O. Calculate the mass percent of douglasite in a 455.0-mg sample if it took 37.20 mL of a 0.1000 M AgNO₃ solution to precipitate all the Cl^– as AgCl. Assume the douglasite is the only source of chloride ion.

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