Douglasite is a mineral with the formula 2 KCl�FeCl2�2 H2O. Calculate the m percent of douglasite in a 545.0 mg sample if it took 37.20 mL of a 0.1000 M AgNO3 solution to precipitate all of the Cl- as AgCl. ume the douglasite is the only source of chloride ion.
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