Now suppose this student told you that she had sissolved the unknown in 250.00 mL, but only used 10.00 mL of that 250.00 mL solution to do the precipitation with 8-HQ. How many grams of Al were in the ORIGINAL 250.00 mL solution (i.e., in the original unknown sample)?
what you need to realize is that concentration is consistent, for example if you take a portion of a solution that portion will have the same concentration as its parent solution.
