5. A blue-green salt
was found to contain iron, chlorine and water. A 2.000 g sample was
dissolved in 100.0 mL of water.
Step 1: A 25.00 mL aliquot of the 100.0 mL solution was placed in
a 250 mL
flask. A solution of potassium permanganate (0.1000 M) was slowly
added. It reacts with iron ions in a ratio of 1 permanganate to 5
iron
ions. It required 5.02 mL of permanganate solution to completely
react
with the iron.
Step 2: A second 25.00 mL aliquot of the 100.0 mL solution was reacted
with
excess AgNO3. The AgCl produced was isolated, washed and dried.
The AgCl produced had a mass of 0.7210 g.
Determine the empirical formula
of this compound.
Answer to Question 5
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