Posted by Un on Thursday, April 3, 2008 at 5:25pm.
Let's see. We transfer 50 mL of a known concn into a 200 mL volumetric flask. The 200 mL flask already contained some water in it. Then you added water to fill to the mark in the 200 mL volumetric flask. What difference does it make how much water was in the flask (at least as long as the amount of water was less than 200-50)? Extra water was just extra water. What matters is that the final volume was 200 you used 50 mL of stock solution to start, so you have diluted it 50 to 200.
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