Posted by Tim on Monday, October 1, 2012 at 7:00pm.
There are two ways to solve this dilution problem; i.e., forward or backwards. Backwards first.
0.00421 x (1000/25) x (125/25) = ?
The forward way is this.
x*(25/125)*(25/1000) = 0.00421 and solve for x, the beginning concn.
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