2. For this one, just use the dilution formula V1C1 = V2C2 and solve for C2, the concentration of the diluted solution. V1 is 2.5 mL, C1 is 0.050 mg/mL, and V2 is 100 mL. Piece of cake!  2). If 2.5 mL of a standard iron solution (1 mL = 0.050 mg Fe) is diluted to 100 mL, what is the final iron concentration in mg Fe/mL?
Unsure of what the question is asking :(
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